Dallas is the third-largest city in Texas

Texas

Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

 and the ninth-largest in the United States. The Dallas-Fort Worth Metroplex is the largest metropolitan area in the South and fourth-largest

Table of United States Metropolitan Statistical Areas

thumb|An enlargeable map of the 942 [[Core Based Statistical Area]]s of the [[United States]]. The 367 [[Metropolitan Statistical Area]]s are shown in red....

 metropolitan area in the United States. Divided between Collin

Collin County, Texas

As of the census of 2000, there were 491,675 people, 181,970 households, and 132,292 families residing in the county. The population density was 580 people per square mile . There were 194,892 housing units at an average density of 230 per square mile...

, Dallas

Dallas County, Texas

As of the census of 2000, there were 2,218,899 people, 807,621 households, and 533,837 families residing in the county. The population density was 2,523 people per square mile . There were 854,119 housing units at an average density of 971/sq mi...

, Denton

Denton County, Texas

Denton County is a county located in the U.S. state of Texas. In 2000, its population was 432,976; in 2009 the estimated population had reached 628,300. Part of the Dallas – Fort Worth Metroplex, it is one of the fastest-growing counties in the United States. The county seat is Denton. The county...

, Kaufman

Kaufman County, Texas

As of the census of 2000, there were 71,313 people, 24,367 households, and 19,225 families residing in the county. The population density was 91/sq mi . There were 26,133 housing units at an average density of 33/sq mi...

, and Rockwall

Rockwall County, Texas

As of the census of 2000, there were 43,080 people, 14,530 households, and 11,972 families residing in the county. The population density was 334 people per square mile . There were 15,351 housing units at an average density of 119 per square mile...

 counties, the city had a 2010 population of approximately 1.2 million, according to 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...

.

The city is the largest economic center of the 12-county metropolitan area (the DFW MSA) that according to the March 2010 U.S.