Chicagoland

The Chicago metropolitan area, or Chicagoland as it is commonly called within the area, is the metropolitan area

Metropolitan area

The term metropolitan area refers to a region consisting of a densely populated urban core and its less-populated surrounding territories, sharing industry, infrastructure, and housing. A metropolitan area usually encompasses multiple jurisdictions and municipalities: neighborhoods, townships,...

associated with the city of Chicago

Chicago

Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the US, after New York City and Los Angeles...

, Illinois

Illinois

Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

and its suburbs. It is the area that is closely linked to the city through social, economic, and cultural ties. There are several definitions of the area, that being the definition by the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

census bureau, the area defined by the Office of Management and Budget (OMB) as the Chicago-Joliet-Naperville, IL-IN-WI Metropolitan Statistical Area (MSA), and the area under the jurisdiction of the Chicago Metropolitan Agency for Planning

Chicago Metropolitan Agency for Planning

The Chicago Metropolitan Agency for Planning is an agency that integrates land use planning and transportation planning for the counties of Cook, DuPage, Kane, Kendall, Lake, McHenry and Will in northeastern Illinois...

(a metropolitan planning organization

Metropolitan planning organization

A metropolitan planning organization is a federally-mandated and federally-funded transportation policy-making organization in the United States that is made up of representatives from local government and governmental transportation authorities...

). The metropolitan Chicago population (CSA) is over 9.8 million people.

Metropolitan statistical area

The Chicago Metropolitan Statistical Area

United States metropolitan area

In the United States a metropolitan statistical area is a geographical region with a relatively high population density at its core and close economic ties throughout the area. Such regions are not legally incorporated as a city or town would be, nor are they legal administrative divisions like...

(MSA) was originally designated by the United States Census Bureau

United States Census Bureau

The United States Census Bureau is the government agency that is responsible for the United States Census. It also gathers other national demographic and economic data...

in 1950. It consisted of the Illinois

Illinois

counties of Cook, DuPage, Kane, Lake and Will, along with Lake County in Indiana

Indiana

Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...

. As surrounding counties saw an increase in their population densities and the number of their residents employed within Cook County, they met Census criteria to be added to the MSA. The Chicago MSA, now defined as the Chicago-Naperville-Joliet, IL-IN-WI MSA, is the third largest MSA by population in the United States with a population of 9,580,567 (2009 estimate).

The Chicago MSA is further subdivided into the Chicago-Naperville-Joliet, IL Metropolitan Division, corresponding roughly to the CMAP region; the Gary, IN Metropolitan Division consisting of the Indiana counties of Lake and Porter, as well as two surrounding counties; and the Lake County-Kenosha County, IL-WI Metropolitan Division.

The 2009 estimated populations of the three Metropolitan Divisions are as follows:

Chicago-Naperville-Joliet, IL Metropolitan Division (7,998,257)
- Cook County
  Cook County, Illinois
  Cook County is a county in the U.S. state of Illinois, with its county seat in Chicago. It is the second most populous county in the United States after Los Angeles County. The county has 5,194,675 residents, which is 40.5 percent of all Illinois residents. Cook County's population is larger than...
  
  (5,287,037)
- DeKalb County
  DeKalb County, Illinois
  DeKalb County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 105,160, which is an increase of 18.2% from 88,969 in 2000. Its county seat is Sycamore. DeKalb County is part of the Chicago metropolitan statistical area.-History:DeKalb County...
  
  (107,333)
- DuPage County
  DuPage County, Illinois
  As of the 2010 Census, the population of the county was 916,924, White Americans made up 77.9% of Dupage County's population; non-Hispanic whites represented 70.5% of the population. Black Americans made up 4.6% of the population. Native Americans made up 0.3% of Dupage County's population...
  
  (932,541)
- Grundy County (48,421)
- Kane County
  Kane County, Illinois
  Kane County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 515,269, which is an increase of 27.5% from 404,119 in 2000. Its county seat is Geneva, and its largest city is Aurora.- Geography :...
  
  (511,892)
- Kendall County
  Kendall County, Illinois
  Kendall County is a county located in the U.S. state of Illinois, about 40 miles southwest of Chicago. According to the 2010 census, it has a population of 114,736, which is an increase of 110% from 54,544 in 2000. It was the fastest-growing county in the United States between the years 2000 and...
  
  (104,821)
- McHenry County
  McHenry County, Illinois
  McHenry County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 308,760, which is an increase of 18.7% from 260,077 in 2000. Its county seat is Woodstock. This county is part of the Chicago metropolitan area. It is the sixth largest county, in...
  
  (320,961)
- Will County
  Will County, Illinois
  As of the census of 2000, there were 502,266 people, 167,542 households, and 131,017 families residing in the county. The population density was 600 people per square mile . There were 175,524 housing units at an average density of 210 per square mile...
  
  (685,251)

Gary, IN Metropolitan Division (704,361)
- Jasper County (IN)
  Jasper County, Indiana
  As of the census of 2000, there were 30,043 people, 10,686 households, and 8,217 families residing in the county. The population density was 54 people per square mile . There were 11,236 housing units at an average density of 20 per square mile...
  
  (32,816)
- Lake County (IN)
  Lake County, Indiana
  Lake County is a county located in the U.S. state of Indiana. In 2010, its population was 496,005, making it Indiana's second-most populous county. The county seat is Crown Point. This county is part of Northwest Indiana and the Chicago metropolitan area. The county contains a mix of urban,...
  
  (494,211)
- Newton County (IN)
  Newton County, Indiana
  Newton County is a county located in the U.S. state of Indiana. As of 2010, the population was 14,244. The county seat is Kentland.- History :...
  
  (13,736)
- Porter County (IN)
  Porter County, Indiana
  Porter County is a county located in the U.S. state of Indiana. As of 2010, the population was 164,343. Much of the population growth has to do with the expansion of the Chicago Metropolitan Area eastward into Indiana. The county seat is Valparaiso...
  
  (163,598)

Lake County-Kenosha County, IL-WI Metropolitan Division (877,949)
- Lake County (IL)
  Lake County, Illinois
  Lake County is a county in the northeastern corner of the state of Illinois, on the shore of Lake Michigan. According to the 2010 census, it has a population of 703,462, which is an increase of 9.2% from 644,356 in 2000. Its county seat is Waukegan. The county is part of the Chicago metropolitan area...
  
  (712,567)
- Kenosha County (WI)
  Kenosha County, Wisconsin
  -Demographics: As of the census of 2000, there were 149,577 people, 56,057 households, and 38,455 families residing in the county. The population density was 548 people per square mile . There were 59,989 housing units at an average density of 220 per square mile...
  
  (165,382)

Combined statistical area

The OMB also defines a slightly larger region as a Combined Statistical Area

Combined Statistical Area

The United States Office of Management and Budget defines micropolitan and metropolitan statistical areas. Metropolitan and micropolitan statistical areas consist of one or more counties...

(CSA). The Chicago-Naperville-Michigan City, IL-IN-WI CSA combines the metropolitan areas of Chicago, Michigan City

Michigan City, Indiana

Michigan City's origins date to 1830, when the land for the city was first purchased by Isaac C. Elston. Elston Middle School, formerly Elston High School, located at 317 Detroit St., is named after the founder....

(in Indiana

Indiana

), and Kankakee

Kankakee, Illinois

Kankakee is a city in Kankakee County, Illinois, USA. As of the 2000 census, the city population was 25,561, and 26,840 as of a 2009 estimate. It is the county seat of Kankakee County...

(in Illinois

Illinois

). This area represents the extent of the labor market pool for the entire region. The CSA has a population of 9,804,845 (2009 estimate).

Chicagoland is an informal name for the Chicago metropolitan area. There is no official definition for Chicagoland, which may be larger than the MSA and include portions of the greater CSA.

Colonel Robert R. McCormick

Robert R. McCormick

Robert Rutherford "Colonel" McCormick was a member of the McCormick family of Chicago who became owner and publisher of the Chicago Tribune newspaper...

, editor and publisher of the Chicago Tribune

Chicago Tribune

The Chicago Tribune is a major daily newspaper based in Chicago, Illinois, and the flagship publication of the Tribune Company. Formerly self-styled as the "World's Greatest Newspaper" , it remains the most read daily newspaper of the Chicago metropolitan area and the Great Lakes region and is...

, usually gets credit for placing the term in common use. McCormick's conception of Chicagoland stretched all the way to nearby parts of Iowa

Iowa

Iowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...

and Michigan

Michigan

Michigan is a U.S. state located in the Great Lakes Region of the United States of America. The name Michigan is the French form of the Ojibwa word mishigamaa, meaning "large water" or "large lake"....

. The first usage came on July 27, 1926 (page 1), with the headline: "Chicagoland's Shrines: A Tour of Discoveries" by reporter James O'Donnell Bennett. He stated that Chicagoland comprised everything in a 200 miles (321.9 km) radius in every direction and reported on many different places in the area. The Tribune was the dominant newspaper in a vast area stretching to the west of the city, and that hinterland

Hinterland

The hinterland is the land or district behind a coast or the shoreline of a river. Specifically, by the doctrine of the hinterland, the word is applied to the inland region lying behind a port, claimed by the state that owns the coast. The area from which products are delivered to a port for...

was closely tied to the metropolis by rail lines and commercial links.

Today, the Chicago Tribunes usage includes the city of Chicago, the rest of Cook County

Cook County, Illinois

Cook County is a county in the U.S. state of Illinois, with its county seat in Chicago. It is the second most populous county in the United States after Los Angeles County. The county has 5,194,675 residents, which is 40.5 percent of all Illinois residents. Cook County's population is larger than...

, eight nearby Illinois counties (Lake

Lake County, Illinois

Lake County is a county in the northeastern corner of the state of Illinois, on the shore of Lake Michigan. According to the 2010 census, it has a population of 703,462, which is an increase of 9.2% from 644,356 in 2000. Its county seat is Waukegan. The county is part of the Chicago metropolitan area...

, McHenry

McHenry County, Illinois

McHenry County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 308,760, which is an increase of 18.7% from 260,077 in 2000. Its county seat is Woodstock. This county is part of the Chicago metropolitan area. It is the sixth largest county, in...

, DuPage

DuPage County, Illinois

As of the 2010 Census, the population of the county was 916,924, White Americans made up 77.9% of Dupage County's population; non-Hispanic whites represented 70.5% of the population. Black Americans made up 4.6% of the population. Native Americans made up 0.3% of Dupage County's population...

, Kane

Kane County, Illinois

Kane County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 515,269, which is an increase of 27.5% from 404,119 in 2000. Its county seat is Geneva, and its largest city is Aurora.- Geography :...

, Kendall

Kendall County, Illinois

Kendall County is a county located in the U.S. state of Illinois, about 40 miles southwest of Chicago. According to the 2010 census, it has a population of 114,736, which is an increase of 110% from 54,544 in 2000. It was the fastest-growing county in the United States between the years 2000 and...

, Grundy, Will

Will County, Illinois

As of the census of 2000, there were 502,266 people, 167,542 households, and 131,017 families residing in the county. The population density was 600 people per square mile . There were 175,524 housing units at an average density of 210 per square mile...

and Kankakee

Kankakee County, Illinois

Kankakee County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 113,449, which is an increase of 9.3% from 103,833 in 2000. Its county seat is Kankakee....

), and two counties in Indiana

Indiana

, Lake

Lake County, Indiana

Lake County is a county located in the U.S. state of Indiana. In 2010, its population was 496,005, making it Indiana's second-most populous county. The county seat is Crown Point. This county is part of Northwest Indiana and the Chicago metropolitan area. The county contains a mix of urban,...

and Porter

Porter County, Indiana

Porter County is a county located in the U.S. state of Indiana. As of 2010, the population was 164,343. Much of the population growth has to do with the expansion of the Chicago Metropolitan Area eastward into Indiana. The county seat is Valparaiso...

. Illinois Department of Tourism literature uses Chicagoland for suburbs in Cook, Lake, DuPage, Kane and Will counties, treating the city separately. The Chicagoland Chamber of Commerce

Chicagoland Chamber of Commerce

The Chicagoland Chamber of Commerce is a non-profit organization promoting business in the Chicago metropolitan area of the United States. The Chamber is a voice at local, state and national levels for approximately 2,600 member companies and their 1.3 million employees...

defines it as all of Cook, and DuPage, Kane, Lake, McHenry and Will counties. However, there are differing viewpoints, some of which are mostly the point of view of whom one speaks with. For example, many residents who live in the further out satellite counties still refer to themselves as being "from Chicago" or "Chicagoans." Until recently, DeKalb County

DeKalb County, Illinois

DeKalb County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 105,160, which is an increase of 18.2% from 88,969 in 2000. Its county seat is Sycamore. DeKalb County is part of the Chicago metropolitan statistical area.-History:DeKalb County...

wasn't considered part of the region, but as the region continues to grow, it is now commonly defined as the "far suburbs" of the city. In addition, company marketing programs such as Construction Data Company's "Chicago and Vicinity" region and the Chicago Automobile Trade Association's "Chicagoland and Northwest Indiana" advertising campaign are directed at the MSA itself as well as DeKalb, LaSalle, Winnebago

Winnebago County, Illinois

Winnebago County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 295,266, which is an increase of 6.1% from 278,418 in 2000...

, Boone, and Ogle

Ogle County, Illinois

Ogle County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 53,497, which is an increase of 4.8% from 51,032 in 2000. Its county seat is Oregon, and its largest city is Rochelle...

counties in Illinois as well as Jasper

Jasper County, Indiana

As of the census of 2000, there were 30,043 people, 10,686 households, and 8,217 families residing in the county. The population density was 54 people per square mile . There were 11,236 housing units at an average density of 20 per square mile...

and Newton

Newton County, Indiana

Newton County is a county located in the U.S. state of Indiana. As of 2010, the population was 14,244. The county seat is Kentland.- History :...

counties in Indiana and Kenosha, Racine and Walworth

Walworth County, Wisconsin

Walworth County is a county located in the U.S. state of Wisconsin. As of 2010, the population was 102,228. Its county seat is Elkhorn.-Geography:According to the U.S...

counties in Wisconsin. The region is part of the Great Lakes Megalopolis

Great Lakes Megalopolis

The Great Lakes Megalopolis consists of the group of North American metropolitan areas which surround the Great Lakes region mainly within the Midwestern United States, the Southern Ontario area of Canada, along with large parts of Pennsylvania, New York, and Quebec...

containing an estimated 54 million people.

Chicago Metropolitan Agency for Planning

(CMAP) is responsible for transportation infrastructure, land use, and long term economic development planning for the areas under its jurisdiction. The area has a MSA population of over 10 million.

Cook County
Cook County, Illinois
Cook County is a county in the U.S. state of Illinois, with its county seat in Chicago. It is the second most populous county in the United States after Los Angeles County. The county has 5,194,675 residents, which is 40.5 percent of all Illinois residents. Cook County's population is larger than...
DuPage County
DuPage County, Illinois
As of the 2010 Census, the population of the county was 916,924, White Americans made up 77.9% of Dupage County's population; non-Hispanic whites represented 70.5% of the population. Black Americans made up 4.6% of the population. Native Americans made up 0.3% of Dupage County's population...
Kane County
Kane County, Illinois
Kane County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 515,269, which is an increase of 27.5% from 404,119 in 2000. Its county seat is Geneva, and its largest city is Aurora.- Geography :...
Kendall County
Kendall County, Illinois
Kendall County is a county located in the U.S. state of Illinois, about 40 miles southwest of Chicago. According to the 2010 census, it has a population of 114,736, which is an increase of 110% from 54,544 in 2000. It was the fastest-growing county in the United States between the years 2000 and...
Lake County
Lake County, Illinois
Lake County is a county in the northeastern corner of the state of Illinois, on the shore of Lake Michigan. According to the 2010 census, it has a population of 703,462, which is an increase of 9.2% from 644,356 in 2000. Its county seat is Waukegan. The county is part of the Chicago metropolitan area...
McHenry County
McHenry County, Illinois
McHenry County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 308,760, which is an increase of 18.7% from 260,077 in 2000. Its county seat is Woodstock. This county is part of the Chicago metropolitan area. It is the sixth largest county, in...
Will County
Will County, Illinois
As of the census of 2000, there were 502,266 people, 167,542 households, and 131,017 families residing in the county. The population density was 600 people per square mile . There were 175,524 housing units at an average density of 210 per square mile...

Geography of Chicago

The city of Chicago lies in the Chicago Plain, a flat and broad area characterized by little topographical relief. The few low hills here and there are sand ridges. North of the Chicago Plain, steep bluffs and ravines run alongside Lake Michigan. Along the southern shore of the Chicago Plain, sand dunes run alongside the lake. The tallest dunes reach up to near 200 feet (61 m) and are found in the Indiana Dunes National Lakeshore

Indiana Dunes National Lakeshore

Indiana Dunes National Lakeshore is a U.S. National Lakeshore located in northwest Indiana and managed by the National Park Service. It was authorized by Congress in 1966. The national lakeshore runs for nearly along the southern shore of Lake Michigan, from Gary, Indiana, on the west to Michigan...

. Surrounding the low plain are bands of moraine

Moraine

A moraine is any glacially formed accumulation of unconsolidated glacial debris which can occur in currently glaciated and formerly glaciated regions, such as those areas acted upon by a past glacial maximum. This debris may have been plucked off a valley floor as a glacier advanced or it may have...

s in the south and west suburbs. These areas are higher and hillier than the Chicago Plain. A continental divide

Continental divide

A continental divide is a drainage divide on a continent such that the drainage basin on one side of the divide feeds into one ocean or sea, and the basin on the other side either feeds into a different ocean or sea, or else is endorheic, not connected to the open sea...

, separating the Mississippi River

Mississippi River

The Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...

watershed from that of the Great Lakes

Great Lakes

The Great Lakes are a collection of freshwater lakes located in northeastern North America, on the Canada – United States border. Consisting of Lakes Superior, Michigan, Huron, Erie, and Ontario, they form the largest group of freshwater lakes on Earth by total surface, coming in second by volume...

and Saint Lawrence River

Saint Lawrence River

The Saint Lawrence is a large river flowing approximately from southwest to northeast in the middle latitudes of North America, connecting the Great Lakes with the Atlantic Ocean. It is the primary drainage conveyor of the Great Lakes Basin...

, runs through the Chicago area.

Demographics

The suburbs, surrounded by easily annexed flat ground, have been expanding at a tremendous rate since the early 1960s. Aurora, Elgin, Joliet, and Naperville are noteworthy for being four of the few boomburb

Boomburb

Boomburb is a neologism for a large, rapidly growing city that remains essentially suburban in character even as it reaches populations more typical of urban core cities...

s outside the Sun Belt

Sun Belt

The Sun Belt or Spanish Belt is a region of the United States generally considered to stretch across the South and Southwest . Another rough boundary of the region is the area south of the 36th parallel, north latitude. It is the largest region which the U.S government does not recognize officially...

, West Coast

West Coast of the United States

West Coast or Pacific Coast are terms for the westernmost coastal states of the United States. The term most often refers to the states of California, Oregon, and Washington. Although not part of the contiguous United States, Alaska and Hawaii do border the Pacific Ocean but can't be included in...

and Mountain States

Mountain States

thumb|300px|Regional definitions vary from source to source. The states shown in dark red are always included, while the striped states are usually considered part of the same region called the Mountain States....

regions, and exurban

Commuter town

A commuter town is an urban community that is primarily residential, from which most of the workforce commutes out to earn their livelihood. Many commuter towns act as suburbs of a nearby metropolis that workers travel to daily, and many suburbs are commuter towns...

Kendall County

Kendall County, Illinois

ranked as the fastest-growing county (among counties with a population greater than 10,000) in the United States between the years 2000 and 2007.

Settlement patterns in the Chicago metropolitan area tend to follow those in the city proper: the northern suburbs along the shore of Lake Michigan

Lake Michigan

Lake Michigan is one of the five Great Lakes of North America and the only one located entirely within the United States. It is the second largest of the Great Lakes by volume and the third largest by surface area, after Lake Superior and Lake Huron...

are comparatively affluent, while the southern suburbs (sometimes known as Chicago Southland

Chicago Southland

The Chicago Southland is the suburban region south and southwest of the City of Chicago, made up of approximately 70 municipalities. This region has been known as the Chicago Southland by the local populace and regional media for about 20 years....

) are less so, with lower median incomes and a lower cost of living. However, there is a major exception to this. While Chicago's West Side is the poorest section of the city, the western and northwestern suburbs contain many affluent areas. According to the 2000 Census, DuPage County

DuPage County, Illinois

had the highest median household income of any county in the Midwestern United States

Midwestern United States

The Midwestern United States is one of the four U.S. geographic regions defined by the United States Census Bureau, providing an official definition of the American Midwest....

.

According to the 2000 U.S. Census, poverty rates of the largest counties from least poverty to most are as follows: McHenry 3.70%, Dupage 5.9%, Will 6.7%, Lake 6.9%, Kane 7.4%, Cook 14.5%.

In an in-depth historical analysis, Keating (2004, 2005) examined the origins of 233 settlements that by 1900 had become suburbs or city neighborhoods of the Chicago metropolitan area. The settlements began as farm centers (41%), industrial towns (30%), residential railroad suburbs (15%), and recreational/institutional centers (13%). Although relations between the different settlement types were at times contentious, there also was cooperation in such undertakings as the construction of high schools.

Population

As the Chicago metropolitan area has grown, more counties have been partly or totally assimilated with the taking of each decennial census.

Census Area		2010 Census	2000 Census	1990 Census	1980 Census	1970 Census	1960 Census	1950 Census
Chicago Chicago Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the US, after New York City and Los Angeles... - Naperville Naperville, Illinois Naperville is a city in DuPage and Will Counties in Illinois in the United States, voted the second best place to live in the United States by Money Magazine in 2006. As of the 2010 census, the city had a total population of 141,853. It is the fifth largest city in the state, behind Chicago,... - Joliet Joliet, Illinois Joliet is a city in Will and Kendall Counties in the U.S. state of Illinois, located southwest of Chicago. It is the county seat of Will County. As of the 2010 census, the city was the fourth-most populated in Illinois, with a population of 147,433. It continues to be Illinois' fastest growing... , IL Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,... -IN Indiana Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is... -WI Wisconsin Wisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...	MSA	9,461,105	9,098,316	8,065,633	7,869,542	7,612,314	6,794,461	5,495,364
Cook County Cook County, Illinois Cook County is a county in the U.S. state of Illinois, with its county seat in Chicago. It is the second most populous county in the United States after Los Angeles County. The county has 5,194,675 residents, which is 40.5 percent of all Illinois residents. Cook County's population is larger than... , Illinois Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...	MSA	5,194,675	5,376,741	5,105,067	5,253,655	5,492,369	5,129,725	4,508,792
DeKalb County DeKalb County, Illinois DeKalb County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 105,160, which is an increase of 18.2% from 88,969 in 2000. Its county seat is Sycamore. DeKalb County is part of the Chicago metropolitan statistical area.-History:DeKalb County... , Illinois Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...	MSA	105,160	88,969	77,932	74,624	71,654	51,714	40,781
DuPage County DuPage County, Illinois As of the 2010 Census, the population of the county was 916,924, White Americans made up 77.9% of Dupage County's population; non-Hispanic whites represented 70.5% of the population. Black Americans made up 4.6% of the population. Native Americans made up 0.3% of Dupage County's population... , Illinois Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...	MSA	916,924	904,161	781,666	658,835	491,882	313,459	154,599
Grundy County, Illinois Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...	MSA	50,063	37,535	32,337	30,582	26,535	22,350	19,217
Kane County Kane County, Illinois Kane County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 515,269, which is an increase of 27.5% from 404,119 in 2000. Its county seat is Geneva, and its largest city is Aurora.- Geography :... , Illinois Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...	MSA	515,269	404,119	317,471	278,405	251,005	208,246	150,388
Kendall County Kendall County, Illinois Kendall County is a county located in the U.S. state of Illinois, about 40 miles southwest of Chicago. According to the 2010 census, it has a population of 114,736, which is an increase of 110% from 54,544 in 2000. It was the fastest-growing county in the United States between the years 2000 and... , Illinois Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...	MSA	114,736	54,544	39,413	37,202	26,374	17,540	12,115
McHenry County McHenry County, Illinois McHenry County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 308,760, which is an increase of 18.7% from 260,077 in 2000. Its county seat is Woodstock. This county is part of the Chicago metropolitan area. It is the sixth largest county, in... , Illinois Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...	MSA	308,760	260,077	183,241	147,897	111,555	84,210	50,656
Will County Will County, Illinois As of the census of 2000, there were 502,266 people, 167,542 households, and 131,017 families residing in the county. The population density was 600 people per square mile . There were 175,524 housing units at an average density of 210 per square mile... , Illinois Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...	MSA	677,560	502,266	357,313	324,460	249,498	191,617	134,336
Jasper County Jasper County, Indiana As of the census of 2000, there were 30,043 people, 10,686 households, and 8,217 families residing in the county. The population density was 54 people per square mile . There were 11,236 housing units at an average density of 20 per square mile... , Indiana Indiana Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...	MSA	33,478	30,043	24,960	26,138	20,429	18,842	17,031
Lake County Lake County, Indiana Lake County is a county located in the U.S. state of Indiana. In 2010, its population was 496,005, making it Indiana's second-most populous county. The county seat is Crown Point. This county is part of Northwest Indiana and the Chicago metropolitan area. The county contains a mix of urban,... , Indiana Indiana Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...	MSA	496,005	484,564	475,594	522,965	546,253	513,269	368,152
Newton County Newton County, Indiana Newton County is a county located in the U.S. state of Indiana. As of 2010, the population was 14,244. The county seat is Kentland.- History :... , Indiana Indiana Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...	MSA	14,244	14,566	13,551	14,844	11,606	11,502	11,006
Porter County Porter County, Indiana Porter County is a county located in the U.S. state of Indiana. As of 2010, the population was 164,343. Much of the population growth has to do with the expansion of the Chicago Metropolitan Area eastward into Indiana. The county seat is Valparaiso... , Indiana Indiana Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...	MSA	164,343	146,798	128,932	119,816	87,114	60,279	40,076
Lake County Lake County, Illinois Lake County is a county in the northeastern corner of the state of Illinois, on the shore of Lake Michigan. According to the 2010 census, it has a population of 703,462, which is an increase of 9.2% from 644,356 in 2000. Its county seat is Waukegan. The county is part of the Chicago metropolitan area... , Illinois Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...	MSA	703,462	644,356	516,418	440,372	382,638	293,656	179,097
Kenosha County Kenosha County, Wisconsin -Demographics: As of the census of 2000, there were 149,577 people, 56,057 households, and 38,455 families residing in the county. The population density was 548 people per square mile . There were 59,989 housing units at an average density of 220 per square mile... , Wisconsin Wisconsin Wisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...	MSA	166,426	149,577	128,181	123,137	117,917	100,615	75,238
Kankakee County Kankakee County, Illinois Kankakee County is a county located in the U.S. state of Illinois. According to the 2010 census, it has a population of 113,449, which is an increase of 9.3% from 103,833 in 2000. Its county seat is Kankakee.... , Illinois Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...	CSA	113,449	103,833	96,255	102,926	97,250	92,063	73,524
LaPorte County LaPorte County, Indiana LaPorte County is a county located in the U.S. state of Indiana. As of 2010, the population was 111,467. The county seat is the city of La Porte. This county is part of the Chicago metropolitan area, Northwest Indiana and Michiana. The largest city is Michigan City... , Indiana Indiana Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...	CSA	111,467	110,106	107,066	108,632	105,342	95,111	76,808
Chicago Chicago Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the US, after New York City and Los Angeles... - Naperville Naperville, Illinois Naperville is a city in DuPage and Will Counties in Illinois in the United States, voted the second best place to live in the United States by Money Magazine in 2006. As of the 2010 census, the city had a total population of 141,853. It is the fifth largest city in the state, behind Chicago,... - Joliet Joliet, Illinois Joliet is a city in Will and Kendall Counties in the U.S. state of Illinois, located southwest of Chicago. It is the county seat of Will County. As of the 2010 census, the city was the fourth-most populated in Illinois, with a population of 147,433. It continues to be Illinois' fastest growing... , IL Illinois Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,... -IN Indiana Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is... -WI Wisconsin Wisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...	CSA	9,686,021	9,312,255	8,385,397	8,264,490	8,089,421	7,204,198	5,911,816

Counties highlighted in gray were not included in the MSA for that census.
The CSA totals in blue are the totals of all the counties listed above, regardless of whether they were included in the Chicago Combined Statistical Area at the time.

Over 100,000 population

Aurora
Aurora, Illinois
Aurora is the second most populous city in the U.S. state of Illinois, and the 112th largest city in the United States. A suburb of Chicago, located west of the Loop, its population in 2010 was 197,899. Originally founded within Kane County, Aurora's city limits have expanded greatly over the past...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Elgin
Elgin, Illinois
Elgin is a city in northern Illinois located roughly northwest of Chicago on the Fox River. Most of Elgin lies within Kane County, Illinois, with a portion in Cook County, Illinois...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Joliet
Joliet, Illinois
Joliet is a city in Will and Kendall Counties in the U.S. state of Illinois, located southwest of Chicago. It is the county seat of Will County. As of the 2010 census, the city was the fourth-most populated in Illinois, with a population of 147,433. It continues to be Illinois' fastest growing...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Naperville
Naperville, Illinois
Naperville is a city in DuPage and Will Counties in Illinois in the United States, voted the second best place to live in the United States by Money Magazine in 2006. As of the 2010 census, the city had a total population of 141,853. It is the fifth largest city in the state, behind Chicago,...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

Over 50,000 population

Arlington Heights
Arlington Heights, Illinois
Arlington Heights is a village in Cook and Lake counties in the U.S. state of Illinois. A suburb of Chicago, it lies about 25 miles northwest of the city's downtown. The population was 75,101 at the 2010 census....

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Berwyn
Berwyn, Illinois
Berwyn is a city in Cook County, Illinois, co-existent with Berwyn Township, which was formed in 1908 after breaking off from Cicero Township. As of the 2000 census, the city had a total population of 54,016.-Demographics:...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Bolingbrook
Bolingbrook, Illinois
Bolingbrook is a large village in Will and DuPage Counties in the U.S. state of Illinois. As of the 2010 US Census, the population is 73,366...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Cicero
Cicero, Illinois
Cicero is an incorporated town in Cook County, Illinois, United States. The population was 83,891 at the 2010 census. Cicero is named for the town of Cicero, New York, which in turn was named for Marcus Tullius Cicero, the Roman statesman and orator....

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Des Plaines
Des Plaines, Illinois
Des Plaines is a city in Cook County, Illinois, United States. It has adopted the official nickname of "City of Destiny." As of the 2000 census, the city had a total population of 58,720. It is a suburb of Chicago, and is next to O'Hare International Airport...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Evanston
Evanston, Illinois
Evanston is a suburban municipality in Cook County, Illinois 12 miles north of downtown Chicago, bordering Chicago to the south, Skokie to the west, and Wilmette to the north, with an estimated population of 74,360 as of 2003. It is one of the North Shore communities that adjoin Lake Michigan...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Gary
Gary, Indiana
Gary is a city in Lake County, Indiana, United States. The city is in the southeastern portion of the Chicago metropolitan area and is 25 miles from downtown Chicago. The population is 80,294 at the 2010 census, making it the seventh-largest city in the state. It borders Lake Michigan and is known...

, Indiana
Indiana
Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...
Hammond
Hammond, Indiana
Hammond is a city in Lake County, Indiana, United States. It is part of the Chicago metropolitan area. The population was 80,830 at the 2010 census.-Geography:Hammond is located at ....

, Indiana
Indiana
Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...
Hoffman Estates
Hoffman Estates, Illinois
Hoffman Estates is a northwestern suburb of Chicago in Illinois. The village is located primarily in Cook County with a small section in Kane County, Illinois. As of the 2000 census, the village population was 49,495 and estimated to be 52,520 in 2003...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Kenosha
Kenosha, Wisconsin
Kenosha is a city and the county seat of Kenosha County in the State of Wisconsin in United States. With a population of 99,218 as of May 2011, Kenosha is the fourth-largest city in Wisconsin. Kenosha is also the fourth-largest city on the western shore of Lake Michigan, following Chicago,...

, Wisconsin
Wisconsin
Wisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...
Mount Prospect
Mount Prospect, Illinois
Mount Prospect is a village in Elk Grove and Wheeling Townships in Cook County, Illinois, about northwest of downtown Chicago. As of the 2010 census, the village had a total population of 54,167.-Geography:...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Oak Lawn
Oak Lawn, Illinois
Oak Lawn is a village in Cook County, Illinois, United States. The population was 55,245 at the 2000 census.Oak Lawn is a suburb of the city of Chicago, located southwest of the city...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Oak Park
Oak Park, Illinois
Oak Park, Illinois is a suburb bordering the west side of the city of Chicago in Cook County, Illinois, United States. It is the twenty-fifth largest municipality in Illinois. Oak Park has easy access to downtown Chicago due to public transportation such as the Chicago 'L' Blue and Green lines,...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Orland Park
Orland Park, Illinois
Orland Park is a village in Cook County, Illinois, United States; it also extends slightly into Will County. The population was 56,767 at the 2010 census. The office of the Assistant Village Manager, Ellen Baer, states that the Will County section of Orland Park is industrial while the Cook County...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Palatine
Palatine, Illinois
Palatine is a village in Cook County, Illinois, United States. It is a northwestern residential suburb of Chicago. As of the 2000 census, the village had a total population of 65,479, making it the sixth-largest community in Cook County and the 16th-largest in the state of Illinois at that time...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Schaumburg
Schaumburg, Illinois
Schaumburg is a city located in Cook County in northeastern Illinois. A common misspelling of the city name is Schaumberg, a spelling which persists on some modern maps. Schaumburg is located just under northwest of downtown Chicago and approximately northwest of O'Hare International Airport. As...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Skokie
Skokie, Illinois
Skokie is a village in Cook County, Illinois, United States. Its name comes from a Native American word for "fire". A Chicago suburb, for many years Skokie promoted itself as "The World's Largest Village". Its population, per the 2000 census, was 63,348...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Tinley Park
Tinley Park, Illinois
Tinley Park is a village located primarily in Cook County, Illinois, United States with a small portion in Will County. The population was 48,401 at the 2000 census, and 58,322 in the 2007 census. It is one of the fastest growing suburbs south of Chicago...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Waukegan
Waukegan, Illinois
Waukegan is a city and county seat of Lake County, Illinois. As of the 2000 census, the city had a total population of 87,901. The 2010 population was 89,078. It is the ninth-largest city in Illinois by population...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
Wheaton
Wheaton, Illinois
Wheaton is an affluent community located in DuPage County, Illinois, approximately west of Chicago and Lake Michigan. Wheaton is the county seat of DuPage County...

, Illinois
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

Urban areas within the Chicago CSA

Within the boundary of the 16-county Chicago Consolidated Statistical Area lies the Chicago urban area, as well as 27 smaller urban areas and clusters. Smallest gap indicates the shortest distance between the given urban area or cluster and the Chicago urban area.

Rank	Urban area	type	Population (2000 census)	Land Area (km²)	Smallest gap (km)
1	Chicago-Aurora-Elgin-Joliet-Waukegan, IL-IN	UA	8,307,904	5,498.1	n/a
2	Round Lake Beach-McHenry-Grayslake, IL-WI^ †	UA	226,848	344.9	2
3	Kenosha, WI †	UA	110,942	109.2	1
4	Michigan City-LaPorte, IN-MI^^ †	UA	66,199	86.1	3
5	Kankakee-Bradley-Bourbonnais, IL	UA	65,073	71.5	>10
6	DeKalb-Sycamore, IL	UA	55,805	46.3	>10
7	Woodstock, IL †	UC	20,219	21.1	4
8	Morris, IL	UC	13,927	19.3	>10
9	Sandwich, IL^^^	UC	12,248	23.9	>10
10	Braidwood-Coal City, IL	UC	11,607	19.5	>10
11	Harvard, IL	UC	8,575	13.3	>10
12	Lakes of the Four Seasons, IN †	UC	8,450	12.5	4
13	Lowell, IN	UC	7,914	15.8	>10
14	Wilmington, IL	UC	7,107	20.8	>10
15	Manteno, IL	UC	7,106	9.4	>10
16	Marengo, IL	UC	6,854	8.6	>10
17	Rensselaer, IN	UC	6,096	10.9	>10
18	Plano, IL †	UC	5,911	6.5	3
19	Genoa, IL	UC	5,137	5.5	>10
20	Genoa City, WI-IL^^^^ †	UC	5,126	12.5	>10
21	Westville, IN	UC	5,077	4.4	>10
22	Hebron, IN	UC	4,150	11.7	>10
23	Momence, IL	UC	3,711	9.7	>10
24	Peotone, IL †	UC	3,358	3.5	9
25	Wonder Lake, IL †	UC	2,798	2.0	5
26	Monee, IL †	UC	2,787	3.7	3
27	Union Township, IN †	UC	2,593	4.9	1
28	Hampshire, IL †	UC	2,591	2.0	6

The formerly distinct urban areas of Aurora, Elgin, Joliet, and Waukegan were absorbed into the Chicago UA as of the 2000 census.

† These urban areas and urban clusters are expected to be joined to the Chicago Urban Area by the next census in 2010.

^ The Round Lake Beach-McHenry-Grayslake, IL-WI UA extends into Walworth County, WI, which lies (for the moment) outside the Chicago CSA.

^^ The Michigan City-LaPorte, IN-MI UA extends into Berrien County, MI, which lies (for the moment) outside the Chicago CSA.

^^^ The Sandwich, IL UC extends into LaSalle County, IL, which lies (for the moment) outside the Chicago CSA.

^^^^ The Genoa City, WI-IL UC extends into Walworth County, WI, which lies (for the moment) outside the Chicago CSA.

Economy

The Chicago

Chicago

metropolitan area is home to the corporate headquarters of 57 Fortune 1000

Fortune 1000

Fortune 1000 is a reference to a list maintained by the American business magazine Fortune. The list is of the 1000 largest American companies, ranked on revenues alone...

companies, including Boeing

Boeing

The Boeing Company is an American multinational aerospace and defense corporation, founded in 1916 by William E. Boeing in Seattle, Washington. Boeing has expanded over the years, merging with McDonnell Douglas in 1997. Boeing Corporate headquarters has been in Chicago, Illinois since 2001...

, McDonald's

McDonald's

McDonald's Corporation is the world's largest chain of hamburger fast food restaurants, serving around 64 million customers daily in 119 countries. Headquartered in the United States, the company began in 1940 as a barbecue restaurant operated by the eponymous Richard and Maurice McDonald; in 1948...

, Motorola

Motorola

Motorola, Inc. was an American multinational telecommunications company based in Schaumburg, Illinois, which was eventually divided into two independent public companies, Motorola Mobility and Motorola Solutions on January 4, 2011, after losing $4.3 billion from 2007 to 2009...

, Discover Financial

Discover Financial

Discover Financial Services is an American financial services company, which issues the Discover Card and operates the Discover and Pulse networks...

Services and United Airlines

United Airlines

United Air Lines, Inc., is the world's largest airline with 86,852 employees United Air Lines, Inc., is the world's largest airline with 86,852 employees United Air Lines, Inc., is the world's largest airline with 86,852 employees (which includes the entire holding company United Continental...

, representing a diverse group of industries. The area is a major financial center in North America, and is home to the largest futures exchange

Futures exchange

A futures exchange or futures market is a central financial exchange where people can trade standardized futures contracts; that is, a contract to buy specific quantities of a commodity or financial instrument at a specified price with delivery set at a specified time in the future. These types of...

in the United States, the CME Group

CME Group

The CME Group bases prices for US gasoline on Brent Crude rather than West Texas Intermediate Crude , which many believe is responsible for artificially high gas prices for US consumers...

.

A key piece of infrastructure for several generations was the Union Stock Yards

Union Stock Yards

The Union Stock Yard & Transit Co., or The Yards, was the meat packing district in Chicago for over a century starting in 1865. The district was operated by a group of railroad companies that acquired swampland, and turned it to a centralized processing area...

of Chicago, which from 1865 until 1971 penned and slaughtered millions of cattle and hogs into standardized cuts of beef

Beef

Beef is the culinary name for meat from bovines, especially domestic cattle. Beef can be harvested from cows, bulls, heifers or steers. It is one of the principal meats used in the cuisine of the Middle East , Australia, Argentina, Brazil, Europe and the United States, and is also important in...

and pork

Pork

Pork is the culinary name for meat from the domestic pig , which is eaten in many countries. It is one of the most commonly consumed meats worldwide, with evidence of pig husbandry dating back to 5000 BC....

.

The Chicago area, meanwhile, began to produce significant quantities of telecommunications gear, electronics, steel, crude oil derivatives, automobiles, and industrial capital goods.

By the early 2000s, Illinois' economy had moved toward a dependence on high-value-added services, such as financial trading, higher education

Higher education

Higher, post-secondary, tertiary, or third level education refers to the stage of learning that occurs at universities, academies, colleges, seminaries, and institutes of technology...

, logistics

Logistics

Logistics is the management of the flow of goods between the point of origin and the point of destination in order to meet the requirements of customers or corporations. Logistics involves the integration of information, transportation, inventory, warehousing, material handling, and packaging, and...

, and health care. In some cases, these services clustered around institutions that hearkened back to Illinois's earlier economies. For example, the Chicago Mercantile Exchange, a trading exchange for global derivatives

Derivative (finance)

A derivative instrument is a contract between two parties that specifies conditions—in particular, dates and the resulting values of the underlying variables—under which payments, or payoffs, are to be made between the parties.Under U.S...

, had begun its life as an agricultural futures market

Futures exchange

.

In 2007, the area ranked first among U.S. metro areas in the number of new and expanded corporate facilities. It ranked third in 2008, behind the Houston–Sugar Land–Baytown

Greater Houston

Houston–Sugar Land–Baytown is a 10-county metropolitan area defined by the Office of Management and Budget. It is located along the Gulf Coast region in the U.S. state of Texas...

and Dallas–Fort Worth metropolitan areas, and ranked second behind the New York metropolitan area

New York metropolitan area

The New York metropolitan area, also known as Greater New York, or the Tri-State area, is the region that composes of New York City and the surrounding region...

in 2009.

The Wall Street Journal

The Wall Street Journal

The Wall Street Journal is an American English-language international daily newspaper. It is published in New York City by Dow Jones & Company, a division of News Corporation, along with the Asian and European editions of the Journal....

summarized the Chicago area's economy in November 2006 with the comment that "Chicago has survived by repeatedly reinventing itself."

Transportation

Major airports

Chicago O'Hare International Airport
O'Hare International Airport
Chicago O'Hare International Airport , also known as O'Hare Airport, O'Hare Field, Chicago Airport, Chicago International Airport, or simply O'Hare, is a major airport located in the northwestern-most corner of Chicago, Illinois, United States, northwest of the Chicago Loop...

(ORD)
Chicago Midway International Airport (MDW)
Mitchell International Airport (MKE)
Gary/Chicago International Airport
Gary/Chicago International Airport
Gary/Chicago International Airport is a public airport located three miles northwest of the central business district of Gary, a city in Lake County, Indiana, United States. The airport, which serves the Chicago metropolitan area, is 25 miles southeast of the Chicago Loop...

(GYY)
Chicago Rockford International Airport (RFD) (located in the adjacent Rockford metropolitan area
Rockford metropolitan area
The Rockford Metropolitan Statistical Area, as defined by the United States Census Bureau, is an area consisting of two counties in north-central Illinois, anchored by the city of Rockford. As of the 2000 census, the MSA had a population of 320,204...

)

Rail and transit systems

Chicago Transit Authority
Chicago Transit Authority
Chicago Transit Authority, also known as CTA, is the operator of mass transit within the City of Chicago, Illinois and some of its surrounding suburbs....

trains, locally referred to as "the L"
Chicago 'L'
The L is the rapid transit system serving the city of Chicago and some of its surrounding suburbs. It is operated by the Chicago Transit Authority...

, (after "elevated train") serving Chicago and the near suburbs
Northeast Illinois Regional Commuter Railroad Corporation, also known as Metra
Metra
Metra is the commuter rail division of the Illinois Regional Transportation Authority. The system serves Chicago and its metropolitan area through 240 stations on 11 different rail lines. Throughout the 21st century, Metra has been the second busiest commuter rail system in the United States by...

:
- 4 lines serving southern Cook County and Will County
- 3 lines serving western Cook County, DuPage County, and Kane County
- 1 line serving northwestern Cook County and McHenry County
- 3 lines serving northern Cook County and Lake County, with 1 line extending to Kenosha, Wisconsin
  Kenosha, Wisconsin
  Kenosha is a city and the county seat of Kenosha County in the State of Wisconsin in United States. With a population of 99,218 as of May 2011, Kenosha is the fourth-largest city in Wisconsin. Kenosha is also the fourth-largest city on the western shore of Lake Michigan, following Chicago,...
South Shore Line
South Shore Line (NICTD)
The South Shore Line is an electrically powered interurban commuter rail line operated by the Northern Indiana Commuter Transportation District between Millennium Station in downtown Chicago and the South Bend Regional Airport in South Bend, Indiana...

shares the Metra electric lines and connects Chicago to Gary
Gary, Indiana
Gary is a city in Lake County, Indiana, United States. The city is in the southeastern portion of the Chicago metropolitan area and is 25 miles from downtown Chicago. The population is 80,294 at the 2010 census, making it the seventh-largest city in the state. It borders Lake Michigan and is known...

, Michigan City
Michigan City, Indiana
Michigan City's origins date to 1830, when the land for the city was first purchased by Isaac C. Elston. Elston Middle School, formerly Elston High School, located at 317 Detroit St., is named after the founder....

, ending at South Bend, Indiana
South Bend, Indiana
The city of South Bend is the county seat of St. Joseph County, Indiana, United States, on the St. Joseph River near its southernmost bend, from which it derives its name. As of the 2010 Census, the city had a total of 101,168 residents; its Metropolitan Statistical Area had a population of 316,663...

.
Amtrak
Amtrak
The National Railroad Passenger Corporation, doing business as Amtrak , is a government-owned corporation that was organized on May 1, 1971, to provide intercity passenger train service in the United States. "Amtrak" is a portmanteau of the words "America" and "track". It is headquartered at Union...

operates Union Station
Union Station (Chicago)
Union Station is a major train station that opened in 1925 in Chicago, replacing an earlier 1881 station. It is now the only intercity rail terminal in Chicago, as well as being the city's primary terminal for commuter trains. The station stands on the west side of the Chicago River between Adams...

which is the major Amtrak passenger rail hub with connections to Metra and the L.

Major highways

Interstate 90
Interstate 90
Interstate 90 is the longest Interstate Highway in the United States at . It is the northernmost coast-to-coast interstate, and parallels US 20 for the most part. Its western terminus is in Seattle, at Edgar Martinez Drive S. near Safeco Field and CenturyLink Field, and its eastern terminus is in...

, Interstate 290
Interstate 290 (Illinois)
Interstate 290 is a main Interstate freeway that runs westwards from the Chicago Loop. A portion of I-290 is officially called the Dwight D. Eisenhower Expressway. In short form, it is known as "the Ike" or the Eisenhower...

, Interstate 94
Interstate 94
Interstate 94 is the northernmost east–west Interstate Highway, connecting the Great Lakes and Intermountain regions of the United States. I-94's western terminus is in Billings, Montana at a junction with Interstate 90; its eastern terminus is the U.S...

, Interstate 294
Interstate 294
Interstate 294 is a tolled Interstate Highway in northeastern Illinois, U.S.A.. It forms the southern portion of the Tri-State Tollway in Illinois. I-294 runs from South Holland at Interstates 80 and 94, and Illinois Route 394 to Northbrook at I-94. Interstate 294 is long; are shared with I-80....

, Interstate 88
Interstate 88 (west)
Interstate 88 is an intrastate Interstate Highway in the state of Illinois. It runs from an interchange with Interstate 80 near Silvis and Moline to an interchange with Interstates 290 and 294 in Hillside, near Chicago...

, Interstate 65
Interstate 65
Interstate 65 is a major Interstate Highway in the United States. The southern terminus is located at an intersection with Interstate 10 in Mobile, Alabama, and its northern terminus is at an interchange with Interstate 90 , U.S. Route 12, and U.S...

, Interstate 55
Interstate 55
Interstate 55 is an Interstate Highway in the central United States. Its odd number indicates that it is a north–south Interstate Highway. I-55 goes from LaPlace, Louisiana at Interstate 10 to Chicago at U.S. Route 41 , at McCormick Place. A common nickname for the highway is "double...

, Interstate 355
Interstate 355
Interstate 355 , also known as the Veterans Memorial Tollway, is an Interstate Highway and tollway in the western and southwest suburbs of Chicago, Illinois, U.S. Like most other toll roads in the northeastern portion of the state, I-355 is maintained by a State Highway Authority...

, Interstate 57
Interstate 57
Interstate 57 is an Interstate Highway in Missouri and Illinois that parallels the old Illinois Central rail line for much of its route. It goes from Miner, Missouri, at Interstate 55 to Chicago, Illinois, at Interstate 94. I-57 essentially serves as a shortcut route for travelers headed between...

, Interstate 80
Interstate 80
Interstate 80 is the second-longest Interstate Highway in the United States, following Interstate 90. It is a transcontinental artery running from downtown San Francisco, California to Teaneck, New Jersey in the New York City Metropolitan Area...

Major corridors

In addition to the Chicago Loop

Chicago Loop

The Loop or Chicago Loop is one of 77 officially designated Chicago community areas located in the City of Chicago, Illinois. It is the historic commercial center of downtown Chicago...

, the metro area is home to a few important subregional corridors of commercial activities. Among them are:

Illinois Technology and Research Corridor
Illinois Technology and Research Corridor
The Illinois Technology and Research Corridor is a region of commerce and industry located along Interstate 88 in the Chicago metropolitan area, primarily in DuPage, Kane, and DeKalb Counties...

, along the Ronald Reagan Memorial Tollway
Interstate 88 (west)
Interstate 88 is an intrastate Interstate Highway in the state of Illinois. It runs from an interchange with Interstate 80 near Silvis and Moline to an interchange with Interstates 290 and 294 in Hillside, near Chicago...

(Interstate 88
Interstate 88 (west)
Interstate 88 is an intrastate Interstate Highway in the state of Illinois. It runs from an interchange with Interstate 80 near Silvis and Moline to an interchange with Interstates 290 and 294 in Hillside, near Chicago...

)
Golden Corridor
Golden Corridor
The Golden Corridor is a term used to describe the area around the Jane Addams Memorial Tollway, formerly known as the Northwest Tollway in the Chicago metropolitan area. It is coined as such since the corridor generates a "gold" mine of economic profit for communities in the area...

, along the Jane Addams Memorial Tollway (Interstate 90
Interstate 90
Interstate 90 is the longest Interstate Highway in the United States at . It is the northernmost coast-to-coast interstate, and parallels US 20 for the most part. Its western terminus is in Seattle, at Edgar Martinez Drive S. near Safeco Field and CenturyLink Field, and its eastern terminus is in...

)

Area codes

From 1947 until 1988, the Illinois portion of the Chicago metro area was served by a single area code

North American Numbering Plan

The North American Numbering Plan is an integrated telephone numbering plan administered by Neustar which encompasses 24 countries and territories, including the United States and its territories, Canada, Bermuda, and 16 nations of the Caribbean...

, 312, which abutted the 815 area code. In 1988 the 708 area code was introduced and the 312 area code became exclusive to the city of Chicago.

It became common to call suburbanites "708'ers", in reference to their area code.

The 708 area code was partitioned in 1996 into three area codes, serving different portions of the metro area: 630, 708, and 847.

At the same time that the 708 area code was in trouble, the 312 area code in Chicago was also exhausting its supply of available numbers. As a result, the city of Chicago was divided into two area codes, 312 and 773. Rather than divide the city by a north/south area code, the central business district retained the 312 area code, while the remainder of the city took the new 773 code.

In 2002, the 847 area code was supplemented with the overlay area code 224. In February 2007, the 815 area code (serving outlying portions of the metro area) was supplemented with the overlay area code 779. In October 2007, the overlay area code 331 was implemented to supplement the 630 area with additional numbers.

Plans are in place for overlay codes in the 708, 773, and 312 regions as those area codes become exhausted in the future.

312
Area code 312
Area code 312 is the telephone area code for the Chicago Loop and surrounding areas of the city of Chicago, Illinois. Prior to the split on November 11, 1989, forming 708 , 312 area code originally served much of Greater Chicago...

Chicago - City (The Loop
Chicago Loop
The Loop or Chicago Loop is one of 77 officially designated Chicago community areas located in the City of Chicago, Illinois. It is the historic commercial center of downtown Chicago...

and central neighborhoods, e.g. the Near North Side)
773
Area code 773
Area code 773 went into effect in the city of Chicago, Illinois, on 12 October 1996. The area code covers the city, excluding the downtown core. Originally, the entire city and suburbs were in area code 312. Then, in 1989, area code 708 was created for the suburbs, leaving a rump 312...

Chicago - City (Everywhere else within the city limits, excluding central area)
872
Area code 872
Template:Cite webArea code 872 is a North American Numbering Plan overlay of area codes 312 and 773 in Chicago, Illinois, and entered service on November 7, 2009.-External links:* at North American Numbering Plan Administration's website*...

Chicago - City (overlay for 312 & 773, effective November 7, 2009)
847/224 (North and Northwest Suburbs)
630/331 (Outer Western Suburbs)
708
Area code 708
Area code 708 covers western and southern Cook County and eastern and southern Will County in Illinois. Area code 708 was split off from area code 312 on November 11th 1989, and once covered all of the suburbs of Chicago. In 1996, area code 847 and area code 630 were broken off from 708...

(South and Near West Suburbs)
815/779
Area codes 815 and 779
Area code 815 is a telephone area code for most of the northern third of the state of Illinois, less the core of the Chicago metropolitan area and the area around Moline. It was one of the four original Illinois area codes set up in 1947. A new overlay area code, 779, was implemented on March 17,...

(Far Northwest/Southwest Suburbs; Joliet)
219
Area code 219
219 is the North American telephone area code for Northwest Indiana that includes Lake, Porter, La Porte, Newton, and Jasper counties. The area code includes such cities as Schererville, Chesterton, Lake Station, Crown Point, Cedar Lake, Hobart, Whiting, Gary, Hammond, East Chicago, Merrillville,...

(Northwest Indiana)
574
Area code 574
Area code 574 is a North American Numbering Plan area code for South Bend/North Central Indiana. The area code serves the metropolitan South Bend area, including South Bend, Mishawaka, Elkhart, Goshen, Plymouth, and Warsaw.-History:...

(North-central Indiana)
262
Area code 262
North American telephone area code 262 is a state of Wisconsin area code which covers much of Southeastern Wisconsin, and was created on September 25, 1999 when it was split from Area code 414...

(Southeast Wisconsin surrounding Milwaukee County)

External links

The source of this article is wikipedia, the free encyclopedia. The text of this article is licensed under the GFDL.