The U.S

United States

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

 state of Montana

Montana

Montana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...

 is a large geographical area (147046 square miles (380,847.4 km²)) that includes portions of the Pacific Ocean

Pacific Ocean

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

, Gulf of Mexico

American Mediterranean Sea

The American Mediterranean Sea is the combined waterbody of the Gulf of Mexico and the Caribbean Sea. The American Mediterranean has a surface area of 4.319 million km2 and an average depth of ....

 and Hudson's Bay

Canada Hudson Bay drainage

The Hudson Bay drainage in Canada is the majority of the Hudson Bay Watershed, which has small United States portions in Minnesota, Montana, and North Dakota...

 watersheds

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

, is split by the Continental Divide

Continental Divide

The Continental Divide of the Americas, or merely the Continental Gulf of Division or Great Divide, is the name given to the principal, and largely mountainous, hydrological divide of the Americas that separates the watersheds that drain into the Pacific Ocean from those river systems that drain...

 and is approximately 545 miles (877.1 km) east to west along the Canadian

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 border and 320 miles (515 km) north to south. Historically and officially, this large state has been divided up into a variety of distinct regions. Additionally, Montana is part of a number of larger federal government administrative regions. This is a List of regional designations (official and historical) of Montana.

Historical designations

• Hi-Line
  Hi-Line
  The Hi-Line is a geographical term referring to the portion of the northern United States south of the Canadian border along which runs the main line of the BNSF Railway and U.S. Highway 2...
  
  , is a region of the Montana-Canadian
  Canada
  Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
  
   border along which runs the main line of the Great Northern Railway and U.S. Highway 2.
• Many Glacier
  Many Glacier
  Many Glacier is an area within Glacier National Park which is located in the U.S. state of Montana. The Many Glacier region is located north of the Going-to-the-Sun Road, on the east side of the park. Lake Sherburne is the large lake in the area and the Many Glacier Hotel, the largest hotel within...
  
  , is a region within Glacier National Park. The region is located north of the Going-to-the-Sun Road
  Going-to-the-Sun Road
  Going-to-the-Sun Road is the only road through the heart of Glacier National Park in Montana, USA. It was completed in 1932, and it is the only road that crosses the park, going over the Continental Divide at Logan Pass. A fleet of 1930s red tour buses "jammers", rebuilt in 2001 to run on propane...
  
  , on the east side of the park.
• Medicine Line, the name given the 49th parallel border between the U.S. and Canada between Lake of the Woods
  Lake of the Woods
  Lake of the Woods is a lake occupying parts of the Canadian provinces of Ontario and Manitoba and the U.S. state of Minnesota. It separates a small land area of Minnesota from the rest of the United States. The Northwest Angle and the town of Angle Township can only be reached from the rest of...
  
   and the continental divide by Native Americans
  Native Americans in the United States
  Native Americans in the United States are the indigenous peoples in North America within the boundaries of the present-day continental United States, parts of Alaska, and the island state of Hawaii. They are composed of numerous, distinct tribes, states, and ethnic groups, many of which survive as...
  
   because of its seemingly magical ability to prevent U.S. soldiers from crossing it.
• The Flathead
  The Flathead
  The Flathead, sometimes called Northwestern Montana, is a region of the U.S. state of Montana. It includes Flathead County, and part of Lake County. Notable towns include Bigfork, Kalispell, Polson, and Whitefish. The geography of the Flathead roughly corresponds to the valley where Flathead Lake...
  
  
• Two Medicine
  Two Medicine
  Two Medicine is the collective name of a region located in the southeastern section of Glacier National Park, in the U.S. state of Montana. It has a campground alongside Two Medicine Lake. From the period starting in the late 1890s until the completion of the Going-to-the-Sun Road in 1932, Two...
  
  , is the collective name of a region located in the southeastern section of Glacier National Park.

Tourism regions

The Montana Official Travel Site has designated six distinct regions in the state for travel promotion.

• Custer Country, comprising Big Horn
  Big Horn County, Montana
  - National protected areas :* Bighorn Canyon National Recreation Area * Little Bighorn Battlefield National Monument- Economy :Coal Mining and Agriculture both play major roles in Big Horn County’s economy...
  
  , Carter
  Carter County, Montana
  -Demographics:As of the census of 2000, there were 1,360 people, 543 households, and 382 families residing in the county. The population density was -Demographics:...
  
  , Custer
  Custer County, Montana
  -Economy:The main source of income for Custer County has largely come from cattle ranching and dryland farming. Miles City serves as the center of commerce in an area extending for 100 miles in every direction...
  
  , Dawson
  Dawson County, Montana
  -Economy:Dawson County is known for its dryland grain, coal mines and gas and oil wells. There are 522 current farms and ranches, and 296 commercial businesses.-Demographics:...
  
  , Fallon
  Fallon County, Montana
  Fallon County is a county located in the U.S. state of Montana. As of 2010, the population was 2,890. Its county seat is Baker.Fallon County was created in 1913 after being carved out of Custer County. The name comes from Benjamin O'Fallon, a nephew of Captain William Clark and an Indian agent...
  
  , Golden Valley
  Golden Valley County, Montana
  -Demographics:As of the census of 2000, there were 1,042 people, 365 households, and 263 families residing in the county. The population density was -Demographics:...
  
  , Musselshell
  Musselshell County, Montana
  -Demographics:As of the census of 2000, there are 4,497 people, 1,878 households, and 1,235 families residing in the county. The population density is 2 people per square mile . There are 2,317 housing units at an average density of -Demographics:...
  
  , Powder River
  Powder River County, Montana
  -Demographics:As of the census of 2000, there were 1,858 people, 737 households, and 524 families residing in the county. The population density was -Demographics:...
  
  , Prairie
  Prairie County, Montana
  -Demographics:As of the census of 2000, there were 1,199 people, 537 households, and 354 families residing in the county. The population density was -Demographics:...
  
  , Rosebud
  Rosebud County, Montana
  -Demographics:As of the census of 2000, there were 9,383 people, 3,307 households, and 2,417 families residing in the county. The population density was 2 people per square mile . There were 3,912 housing units at an average density of 1 per square mile...
  
  , Treasure
  Treasure County, Montana
  - Demographics :As of the census of 2000, there were 861 people, 357 households, and 242 families residing in the county. The population density was - Demographics :...
  
  , Wibaux
  Wibaux County, Montana
  -Demographics:As of the census of 2000, there were 1,068 people, 421 households, and 287 families residing in the county. The population density was less than 1 person per square mile . There were 587 housing units at an average density of less than 1/sq mi...
  
  , Yellowstone
  Yellowstone County, Montana
  -National protected areas:* Nez Perce National Historical Park * Pompeys Pillar National Monument-Demographics:As of the census of 2000, there were 129,352 people, 52,084 households, and 34,219 families residing in the county. The population density was 49 people per square mile . There were...
  
   counties. Includes the Little Bighorn Battlefield National Monument
  Little Bighorn Battlefield National Monument
  Little Bighorn Battlefield National Monument preserves the site of the June 25, 1876, Battle of the Little Bighorn, near Crow Agency, Montana, in the United States. It also serves as a memorial to those who fought in the battle: George Armstrong Custer's 7th Cavalry and a combined Lakota-Northern...
  
  .
• Glacier Country
  Glacier Country, Montana
  Glacier Country, Montana is a region in the U.S state of Montana. Glacier Country includes the cities of Missoula, Kalispell, Polson, Libby, Whitefish, Browning, Montana, Eureka, Montana and Thompson Falls. Glacier Country is home to Glacier National Park, and Montana's 2nd largest city- Missoula,...
  
  , comprising Flathead
  Flathead County, Montana
  -National protected areas:* Pacific Northwest National Scenic Trail * Flathead National Forest * Glacier National Park * Kootenai National Forest * Lolo National Forest * Lost Trail National Wildlife Refuge-Demographics:...
  
  , Glacier
  Glacier County, Montana
  -National protected areas:* Glacier National Park * Lewis and Clark National Forest -Demographics:As of the census of 2000, there were 13,247 people, 4,304 households, and 3,245 families residing in the county. The population density was 4 people per square mile . There were 5,243 housing units...
  
  , Granite
  Granite County, Montana
  -National protected areas:*Deerlodge National Forest *Lolo National Forest -Demographics:As of the census of 2000, there were 2,830 people, 1,200 households, and 784 families residing in the county. The population density was 2 people per square mile . There were 2,074 housing units at an average...
  
  , Lake
  Lake County, Montana
  -National protected areas:*Flathead National Forest *National Bison Range *Ninepipe National Wildlife Refuge*Pablo National Wildlife Refuge*Swan River National Wildlife Refuge-Demographics:...
  
  , Lincoln
  Lincoln County, Montana
  -National protected areas:* Pacific Northwest National Scenic Trail *Flathead National Forest *Kaniksu National Forest *Kootenai National Forest -Demographics:...
  
  , Mineral
  Mineral County, Montana
  -Demographics:As of the census of 2000, there were 3,884 people, 1,584 households, and 1,067 families residing in the county. The population density was 3 people per square mile . There were 1,961 housing units at an average density of 2 per square mile...
  
  , Missoula
  Missoula County, Montana
  -National protected areas:*Bitterroot National Forest *Flathead National Forest *Lolo National Forest *Rattlesnake National Recreation Area-Demographics:...
  
  , Ravalli
  Ravalli County, Montana
  -National protected areas:*Bitterroot National Forest *Lee Metcalf National Wildlife Refuge*Lolo National Forest -Demographics:As of the census of 2000 , there were 36,070 people, 14,289 households, and 10,188 families residing in the county. The population density was 15 people per square mile...
  
  , and Sanders
  Sanders County, Montana
  Sanders County is a county located in the U.S. state of Montana. As of 2010, the population was 11,413. Its county seat is Thompson Falls.-Geography:According to the U.S...
  
   counties. Includes Glacier National Park.
• Gold West Country, comprising Beaverhead
  Beaverhead County, Montana
  -National protected areas:* Beaverhead National Forest * Big Hole National Battlefield* Nez Perce National Historical Park * Red Rock Lakes National Wildlife Refuge-History:...
  
  , Broadwater
  Broadwater County, Montana
  -Economy:Agriculture is one of the primary industries in Broadwater County. RY Timber and Wheat Montana Bakery were the largest private employers according to the 2000 Census.-Demographics:...
  
  , Deer Lodge
  Deer Lodge County, Montana
  -National protected areas:*Beaverhead National Forest *Deerlodge National Forest -Demographics:As of the census of 2000, there were 9,417 people, 3,995 households, and 2,524 families residing in the county. The population density was 13 people per square mile . There were 4,958 housing units at an...
  
  , Jefferson
  Jefferson County, Montana
  -National protected areas:*Deerlodge National Forest *Helena National Forest -Demographics:As of the census of 2000, there were 10,049 people, 3,747 households, and 2,847 families residing in the county. The population density was 6 people per square mile . There were 4,199 housing units at an...
  
  , Lewis and Clark
  Lewis and Clark County, Montana
  -National protected areas:* Flathead National Forest * Helena National Forest * Lewis and Clark National Forest * Lolo National Forest * Rocky Mountain Front Conservation Area -Demographics:...
  
  , Madison
  Madison County, Montana
  -National protected areas:*Beaverhead National Forest *Deerlodge National Forest *Gallatin National Forest -Demographics:As of the census of 2000, there were 6,851 people, 2,956 households, and 1,921 families residing in the county. The population density was 2 people per square mile...
  
  , Powell
  Powell County, Montana
  -National protected areas:* Beaverhead-Deerlodge National Forest * Flathead National Forest * Grant-Kohrs Ranch National Historic Site* Helena National Forest * Lolo National Forest * Bob Marshall Wilderness Area...
  
  , and Silver Bow
  Silver Bow County, Montana
  -National protected areas:*Beaverhead National Forest *Deerlodge National Forest -Demographics:As of the census of 2000, there were 34,606 people, 14,432 households, and 8,933 families residing in the county. The population density was 48 people per square mile . There were 16,176 housing units at...
  
   counties.
• Missouri River Country, comprising Daniel
  Daniels County, Montana
  -Economy:The main source of income for Daniels County has been cattle and dryland wheat.-Demographics:As of the census of 2000, there were 2,017 people, 892 households, and 561 families residing in the county. The population density was 1.4 people per square mile . There were 1,154 housing units...
  
  , Garfield
  Garfield County, Montana
  -Politics:Garfield County is a solidly Republican county. It might be the most Republican county in Montana and one of the most Republican in the nation....
  
  , McCone
  McCone County, Montana
  -Demographics:As of the census of 2000, there were 1,977 people, 810 households, and 596 families residing in the county. The population density was 1 people per square mile . There were 1,087 housing units at an average density of 0 per square mile...
  
  , Phillips
  Phillips County, Montana
  -National protected areas:* Bowdoin National Wildlife Refuge* Charles M. Russell National Wildlife Refuge * Hewitt Lake National Wildlife Refuge* UL Bend National Wildlife Refuge* Upper Missouri River Breaks National Monument -Demographics:...
  
  , Richland
  Richland County, Montana
  -Demographics:As of the census of 2000, there were 9,667 people, 3,878 households, and 2,652 families residing in the county. The population density was 5 people per square mile . There were 4,557 housing units at an average density of 2 per square mile...
  
  , Roosevelt
  Roosevelt County, Montana
  -National protected areas:* Fort Union Trading Post National Historic Site * Medicine Lake National Wildlife Refuge -Demographics:As of the census of 2000, there were 10,620 people, 3,581 households, and 2,614 families residing in the county. The population density was 4 people per square mile...
  
  , Sheridan
  Sheridan County, Montana
  -Demographics:As of the census of 2000, there were 4,105 people, 1,741 households, and 1,140 families residing in the county. The population density was 2.4 people per square mile . There were 2,167 housing units at an average density of 1.3 per square mile...
  
  , Valley
  Valley County, Montana
  -Demographics:As of the census of 2000, there were 7,675 people, 3,150 households, and 2,129 families residing in the county. The population density was 2 people per square mile . There were 4,847 housing units at an average density of 1 per square mile...
  
   counties. Includes major portions of the Montana Dinosaur Trail
  Montana Dinosaur Trail
  The is a series of fourteen Dinosaur themed museums, state parks and other attractions in twelve communities located in the central and eastern regions of the state of Montana in the United States of America. The trail, a plan to increase attendance at the region's museums and drive tourism in...
  
  .
• Russell Country, comprising Blaine
  Blaine County, Montana
  -National protected areas:* Black Coulee National Wildlife Refuge* Nez Perce National Historical Park * Upper Missouri River Breaks National Monument -Economy:The main industry in Blaine County is Agriculture...
  
  , Cascade
  Cascade County, Montana
  -National protected areas:*Benton Lake National Wildlife Refuge*Lewis and Clark National Forest -Economy:Malmstrom Air Force Base is a driving force in the regional economy...
  
  , Chouteau
  Chouteau County, Montana
  -National protected areas:* Lewis and Clark National Forest * Upper Missouri River Breaks National Monument -Economy:Chouteau County is the largest winter wheat producer for the state of Montana...
  
  , Fergus
  Fergus County, Montana
  -National protected areas:* Charles M. Russell National Wildlife Refuge * Lewis and Clark National Forest * Upper Missouri River Breaks National Monument -Demographics:...
  
  , Glacier
  Glacier County, Montana
  -National protected areas:* Glacier National Park * Lewis and Clark National Forest -Demographics:As of the census of 2000, there were 13,247 people, 4,304 households, and 3,245 families residing in the county. The population density was 4 people per square mile . There were 5,243 housing units...
  
  , Hill
  Hill County, Montana
  -National protected areas:*Creedman Coulee National Wildlife Refuge*Lake Thibadeau National Wildlife Refuge-Demographics:As of the census of 2000, there were 16,673 people, 6,457 households, and 4,255 families residing in the county. The population density was 6 people per square mile . There were...
  
  , Liberty County, Montana
  Liberty County, Montana
  -Demographics:As of the census of 2000, there were 2,158 people, 833 households, and 583 families residing in the county. The population density was 2 people per square mile . There were 1,070 housing units at an average density of 1 per square mile...
  
  , Meagher
  Meagher County, Montana
  -National protected areas:*Gallatin National Forest *Helena National Forest *Lewis and Clark National Forest -Demographics:As of the census of 2000, there were 1,932 people, 803 households, and 529 families residing in the county...
  
  , Petroleum
  Petroleum County, Montana
  -National protected areas:*Charles M. Russell National Wildlife Refuge *War Horse National Wildlife Refuge-Demographics:At the 2000 census, there were 493 people, 211 households and 136 families residing in the county. The population density was 0.29 per square mile . There were 292 housing units...
  
  , Pondera
  Pondera County, Montana
  -National protected area:*Lewis and Clark National Forest *Rocky Mountain Front Conservation Area -Demographics:As of the census of 2000, there were 6,424 people, 2,410 households, and 1,740 families residing in the county. The population density was 4 people per square mile . There were 2,834...
  
  , Toole
  Toole County, Montana
  -Demographics:As of the census of 2000, there were 5,267 people, 1,962 households, and 1,308 families residing in the county. The population density was 3 people per square mile . There were 2,300 housing units at an average density of 1 per square mile...
  
  , and Teton
  Teton County, Montana
  -National protected area:*Lewis and Clark National Forest *Rocky Mountain Front Conservation Area -Demographics:As of the census of 2000, there were 6,445 people, 2,538 households, and 1,761 families residing in the county. The population density was 3 people per square mile . There were 2,910...
  
   counties. The region is named for the influence on the area by cowboy artist Charles M. Russell
  Charles Marion Russell
  Charles Marion Russell , also known as C. M. Russell, Charlie Russell, and "Kid" Russell, was an artist of the Old American West. Russell created more than 2,000 paintings of cowboys, Indians, and landscapes set in the Western United States, in addition to bronze sculptures...
  
  .
• Yellowstone Country, comprising Carbon
  Carbon County, Montana
  -National protected areas:* Bighorn Canyon National Recreation Area * Custer National Forest * Gallatin National Forest -Economy:During the early history of Carbon County, coal mining was the predominant industry...
  
  , Gallatin
  Gallatin County, Montana
  -National protected areas:* Gallatin National Forest * Yellowstone National Park -Demographics:As of the census of 2000, there were 67,831 people, 26,323 households, and 16,188 families residing in the county. The population density was 26 people per square mile . There were 29,489 housing units...
  
  , Park
  Park County, Montana
  Park Counties in Montana and Wyoming are among the very few pairs of counties in the United States with the same name to border each other across state lines.-National protected areas:* Custer National Forest * Gallatin National Forest...
  
  , Stillwater
  Stillwater County, Montana
  -National protected areas:*Custer National Forest *Hailstone National Wildlife Refuge*Halfbreed Lake National Wildlife Refuge-Demographics:...
  
   and Sweet Grass
  Sweet Grass County, Montana
  -National protected areas:*Custer National Forest *Gallatin National Forest *Lewis and Clark National Forest -Demographics:As of the census of 2000, there were 3,609 people, 1,476 households, and 987 families residing in the county. The population density was 2 people per square mile...
  
   counties. Includes northern and western gateways to Yellowstone National Park
  Yellowstone National Park
  Yellowstone National Park, established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872, is a national park located primarily in the U.S. state of Wyoming, although it also extends into Montana and Idaho...
  
  .

Department of Fish, Wildlife and Parks regions

The Montana Department of Fish, Wildlife and Parks

Montana Department of Fish, Wildlife and Parks

The Montana Department of Fish, Wildlife and Parks is a government agency in the executive branch state of Montana in the United States with responsibility for protecting sustainable fish, wildlife, and state-owned park resources in Montana for the purpose of providing recreational activities...

 has designated seven administrative regions for the purposes of fish, wildlife and parks management.

• Region 1, Northwest Montana, (Kalispell, Montana
  Kalispell, Montana
  Kalispell is a city in and the county seat of Flathead County, Montana, United States. The 2010 census put Kalispell's population at 19,927 up 5,704 over 2000. At 40.1% this is the largest percentage of growth of any incorporated city in Montana. Kalispell is the largest city and commercial center...
  
  ), includes Flathead Lake
  Flathead Lake
  Flathead Lake is the largest natural freshwater lake in the western part of the contiguous United States. With a surface area of between and , it is slightly larger than Lake Tahoe. The lake is a remnant of the ancient inland sea, Lake Missoula of the era of the last interglacial. Flathead Lake...
  
  
• Region 2, West Central Montana, (Missoula, Montana
  Missoula, Montana
  Missoula is a city located in western Montana and is the county seat of Missoula County. The 2010 Census put the population of Missoula at 66,788 and the population of Missoula County at 109,299. Missoula is the principal city of the Missoula Metropolitan Area...
  
  ), includes the Clark Fork
  Clark Fork (river)
  The Clark Fork is a river in the U.S. states of Montana and Idaho, approximately long. The largest river by volume in Montana, it drains an extensive region of the Rocky Mountains in western Montana and northern Idaho in the watershed of the Columbia River, flowing northwest through a long...
  
  , Blackfoot
  Blackfoot River (Montana)
  The Blackfoot River, sometimes called the Big Blackfoot River to distinguish it from the Little Blackfoot River, is a snow-fed and spring-fed river in western Montana. The Blackfoot River begins in Lewis and Clark County at the Continental Divide, 10 miles northeast of the town of Lincoln...
  
   and Bitterroot
  Bitterroot River
  The Bitterroot River is a tributary of the Clark Fork River in southwestern Montana, USA. It runs for about 75 miles  south-to-north through the Bitterroot Valley, from the confluence of its West and East forks near Conner to the Clark Fork near Missoula.Ravalli County and Missoula County...
  
   rivers.
• Region 3, Southwest Montana, (Bozeman, Montana
  Bozeman, Montana
  Bozeman is a city in and the county seat of Gallatin County, Montana, United States, in the southwestern part of the state. The 2010 census put Bozeman's population at 37,280 making it the fourth largest city in the state. It is the principal city of the Bozeman micropolitan area, which consists...
  
  ), includes the Madison
  Madison River
  The Madison River is a headwater tributary of the Missouri River, approximately 183 miles long, in Wyoming and Montana. Its confluence with the Jefferson and Gallatin rivers near Three Forks, Montana form the Missouri River....
  
  , Gallatin
  Gallatin River
  The Gallatin River is a tributary of the Missouri River, approximately 120 mi , in the U.S. states of Wyoming and Montana...
  
  , Jefferson
  Jefferson River
  The Jefferson River is a tributary of the Missouri River, approximately long, in the U.S. state of Montana. The Jefferson River and the Madison River form the official beginning of the Missouri at Missouri Headwaters State Park near Three Forks...
  
  , upper Missouri
  Missouri River
  The Missouri River flows through the central United States, and is a tributary of the Mississippi River. It is the longest river in North America and drains the third largest area, though only the thirteenth largest by discharge. The Missouri's watershed encompasses most of the American Great...
  
  , upper Yellowstone
  Yellowstone River
  The Yellowstone River is a tributary of the Missouri River, approximately long, in the western United States. Considered the principal tributary of the upper Missouri, the river and its tributaries drain a wide area stretching from the Rocky Mountains in the vicinity of the Yellowstone National...
  
  , Beaverhead
  Beaverhead River
  The Beaverhead River is an approximately -long tributary of the Jefferson River in southwest Montana . It drains an area of roughly . The river's original headwaters, formed by the confluence of the Red Rock River and Horse Prairie Creek, are now flooded under Clark Canyon Reservoir, which also...
  
  , and Big Hole
  Big Hole River
  The Big Hole River is a tributary of the Jefferson River, approximately 153 miles  long, in southwestern Montana in the United States. It rises in Skinner lake in the Beaverhead National Forest in the Beaverhead Mountains of the Bitterroot Range at the continental divide along the...
  
   rivers.
• Region 4, North Central Montana, (Great Falls, Montana
  Great Falls, Montana
  Great Falls is a city in and the county seat of Cascade County, Montana, United States. The population was 58,505 at the 2010 census. It is the principal city of the Great Falls, Montana Metropolitan Statistical Area, which encompasses all of Cascade County...
  
  ), includes the lower Missouri and Smith
  Smith River (Montana)
  Smith River is a tributary of the Missouri River, in central Montana, in the United States. It rises in southern Meagher County in the Castle Mountains and flows northwest in the valley between the Big Belt and Little Belt mountains, past White Sulphure Springs and past Smith River State Park...
  
   rivers.
• Region 5, South Central Montana, (Billings, Montana
  Billings, Montana
  Billings is the largest city in the U.S. state of Montana, and is the principal city of the Billings Metropolitan Area, the largest metropolitan area in over...
  
  ), includes the Yellowstone
  Yellowstone River
  The Yellowstone River is a tributary of the Missouri River, approximately long, in the western United States. Considered the principal tributary of the upper Missouri, the river and its tributaries drain a wide area stretching from the Rocky Mountains in the vicinity of the Yellowstone National...
  
  , Stillwater, Bighorn
  Bighorn River
  The Bighorn River is a tributary of the Yellowstone, approximately long, in the western United States in the states of Wyoming and Montana. The river was named in 1805 by fur trader François Larocque for the Bighorn Sheep he saw along its banks as he explored the Yellowstone River.The upper...
  
  , and Boulder rivers.
• Region 6, North East Montana, (Glasgow, Montana
  Glasgow, Montana
  Glasgow is a city in and the county seat of Valley County, Montana, United States. The population was 3,253 at the 2000 census.-History:Glasgow was founded in 1887 as a railroad town by James J. Hill, who was responsible for creating many communities along the Hi-Line. The town was named after...
  
  ), includes Fort Peck Reservoir
  Fort Peck Dam
  The Fort Peck Dam is the highest of six major dams along the Missouri River, located in northeast Montana in the United States, near Glasgow, and adjacent to the community of Fort Peck...
  
   on the Missouri River.
• Region 7, South East Montana, (Miles City, Montana
  Miles City, Montana
  Miles City is a city in and the county seat of Custer County, Montana, United States. The population was 8,123 at the 2010 census.- History :...
  
  ), includes the Missouri, Yellowstone and Tongue
  Tongue River (Montana)
  The Tongue River is a tributary of the Yellowstone River, approximately 265 mi long, in the U.S. states of Wyoming and Montana. The Tongue rises in Wyoming in the Big Horn Mountains, flows through northern Wyoming and southeastern Montana and empties into the Yellowstone River at Miles City,...
  
   rivers.

U.S. Fish and Wildlife Service

The U.S. Fish and Wildlife Service includes Montana in the Mountain-Prairie region which includes Colorado

Colorado

Colorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...

, Kansas

Kansas

Kansas is a US state located in the Midwestern United States. It is named after the Kansas River which flows through it, which in turn was named after the Kansa Native American tribe, which inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south...

, Nebraska

Nebraska

Nebraska is a state on the Great Plains of the Midwestern United States. The state's capital is Lincoln and its largest city is Omaha, on the Missouri River....

, North Dakota

North Dakota

North Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....

, South Dakota

South Dakota

South Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux American Indian tribes. Once a part of Dakota Territory, South Dakota became a state on November 2, 1889. The state has an area of and an estimated population of just over...

, Utah

Utah

Utah is a state in the Western United States. It was the 45th state to join the Union, on January 4, 1896. Approximately 80% of Utah's 2,763,885 people live along the Wasatch Front, centering on Salt Lake City. This leaves vast expanses of the state nearly uninhabited, making the population the...

, and Wyoming

Wyoming

Wyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...

.

Bureau of Indian Affairs agencies

Montana east of the continental divide, along with Wyoming

Wyoming

Wyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...

 makes up the Rocky Mountain Region of the Bureau of Indian Affairs

Bureau of Indian Affairs

The Bureau of Indian Affairs is an agency of the federal government of the United States within the US Department of the Interior. It is responsible for the administration and management of of land held in trust by the United States for Native Americans in the United States, Native American...

 (BIA) which includes the following Indian agencies in Montana.

• Blackfeet Agency, services the Blackfeet Indian Reservation
  Blackfeet Indian Reservation
  The Blackfeet Indian Reservation or Blackfeet Nation is an Indian reservation of the Blackfeet tribe in Montana in the United States. It is located east of Glacier National Park and borders Canada to the north. Cut Bank Creek and Birch Creek make up part of its eastern and southern borders...
  
   in Glacier
  Glacier County, Montana
  -National protected areas:* Glacier National Park * Lewis and Clark National Forest -Demographics:As of the census of 2000, there were 13,247 people, 4,304 households, and 3,245 families residing in the county. The population density was 4 people per square mile . There were 5,243 housing units...
  
   and Pondera
  Pondera County, Montana
  -National protected area:*Lewis and Clark National Forest *Rocky Mountain Front Conservation Area -Demographics:As of the census of 2000, there were 6,424 people, 2,410 households, and 1,740 families residing in the county. The population density was 4 people per square mile . There were 2,834...
  
   Counties.
• Crow Agency, services the Crow Indian Reservation
  Crow Indian Reservation
  The Crow Indian Reservation is the homeland of the Crow Tribe of Indians of the State of Montana in the United States. The reservation is located in parts of Big Horn, Yellowstone, and Treasure counties in southern Montana...
  
   in Big Horn
  Big Horn County, Montana
  - National protected areas :* Bighorn Canyon National Recreation Area * Little Bighorn Battlefield National Monument- Economy :Coal Mining and Agriculture both play major roles in Big Horn County’s economy...
  
  , Yellowstone
  Yellowstone County, Montana
  -National protected areas:* Nez Perce National Historical Park * Pompeys Pillar National Monument-Demographics:As of the census of 2000, there were 129,352 people, 52,084 households, and 34,219 families residing in the county. The population density was 49 people per square mile . There were...
  
  , and Treasure
  Treasure County, Montana
  - Demographics :As of the census of 2000, there were 861 people, 357 households, and 242 families residing in the county. The population density was - Demographics :...
  
   counties.
• Fort Belknap Agency, services the Fort Belknap Indian Reservation
  Fort Belknap Indian Reservation
  The Fort Belknap Indian Reservation is a semi-autonomous Native American-governed territory covering 1,014.064 sq mi , and is located in north central Montana. This includes the main portion of their homeland, as well as off-reservation trust land. It is shared by two Native American tribes, the...
  
   in Blaine
  Blaine County, Montana
  -National protected areas:* Black Coulee National Wildlife Refuge* Nez Perce National Historical Park * Upper Missouri River Breaks National Monument -Economy:The main industry in Blaine County is Agriculture...
  
   and Phillips
  Phillips County, Montana
  -National protected areas:* Bowdoin National Wildlife Refuge* Charles M. Russell National Wildlife Refuge * Hewitt Lake National Wildlife Refuge* UL Bend National Wildlife Refuge* Upper Missouri River Breaks National Monument -Demographics:...
  
   counties.
• Fort Peck Agency, services the Fort Peck Indian Reservation
  Fort Peck Indian Reservation
  The Fort Peck Indian Reservation is near Fort Peck, Montana. It is the homeland of the Assiniboine and Sioux tribes of Native Americans. It is the ninth-largest Indian reservation in the United States and comprises parts of four counties. In descending order of land area they are Roosevelt, Valley,...
  
   in Roosevelt
  Roosevelt County, Montana
  -National protected areas:* Fort Union Trading Post National Historic Site * Medicine Lake National Wildlife Refuge -Demographics:As of the census of 2000, there were 10,620 people, 3,581 households, and 2,614 families residing in the county. The population density was 4 people per square mile...
  
  , Valley
  Valley County, Montana
  -Demographics:As of the census of 2000, there were 7,675 people, 3,150 households, and 2,129 families residing in the county. The population density was 2 people per square mile . There were 4,847 housing units at an average density of 1 per square mile...
  
  , Daniels
  Daniels County, Montana
  -Economy:The main source of income for Daniels County has been cattle and dryland wheat.-Demographics:As of the census of 2000, there were 2,017 people, 892 households, and 561 families residing in the county. The population density was 1.4 people per square mile . There were 1,154 housing units...
  
  , and Sheridan
  Sheridan County, Montana
  -Demographics:As of the census of 2000, there were 4,105 people, 1,741 households, and 1,140 families residing in the county. The population density was 2.4 people per square mile . There were 2,167 housing units at an average density of 1.3 per square mile...
  
   counties. The agency administers off-reservation trust lands in Montana for the Turtle Mountain Indian Reservation
  Turtle Mountain Indian Reservation
  Turtle Mountain Indian Reservation is an Indian Reservation located primarily in northern North Dakota. It is the land-base for the Turtle Mountain Band of Chippewa Indians ....
  
  .
• Northern Cheyenne Agency, services the Northern Cheyenne Indian Reservation
  Northern Cheyenne Indian Reservation
  The Northern Cheyenne Indian Reservation, formerly named the Tongue River Indian Reservation, is an Indian reservation that is home to the Northern Cheyenne tribe of the Native Americans. It is located around the small towns of Lame Deer and Ashland, Montana, in parts of Rosebud and Big Horn...
  
   in Rosebud
  Rosebud County, Montana
  -Demographics:As of the census of 2000, there were 9,383 people, 3,307 households, and 2,417 families residing in the county. The population density was 2 people per square mile . There were 3,912 housing units at an average density of 1 per square mile...
  
   and Big Horn
  Big Horn County, Montana
  - National protected areas :* Bighorn Canyon National Recreation Area * Little Bighorn Battlefield National Monument- Economy :Coal Mining and Agriculture both play major roles in Big Horn County’s economy...
  
   counties.
• Rocky Boy's Agency, services the Rocky Boy Indian Reservation
  Rocky Boy Indian Reservation
  The Rocky Boy's Indian Reservation is an Indian reservation of the Chippewa Cree Tribe located in the U.S. state of Montana. The smallest reservation in the state, it was established by Executive Order on September 7, 1916. The Chippewa Cree Tribe of the Rocky Boy's Indian Reservation was...
  
   in Hill
  Hill County, Montana
  -National protected areas:*Creedman Coulee National Wildlife Refuge*Lake Thibadeau National Wildlife Refuge-Demographics:As of the census of 2000, there were 16,673 people, 6,457 households, and 4,255 families residing in the county. The population density was 6 people per square mile . There were...
  
   and Chouteau County
  Chouteau County, Montana
  -National protected areas:* Lewis and Clark National Forest * Upper Missouri River Breaks National Monument -Economy:Chouteau County is the largest winter wheat producer for the state of Montana...
  
  .

The Flathead Agency is in the BIA Northwest Region and services the Flathead Indian Reservation

Flathead Indian Reservation

The Flathead Indian Reservation, located in western Montana on the Flathead River, is home to the Bitterroot Salish, Kootenai, and Pend d'Oreilles Tribes - also known as theConfederated Salish and Kootenai Tribes of the Flathead Nation...

 in
Lake

Lake County, Montana

-National protected areas:*Flathead National Forest *National Bison Range *Ninepipe National Wildlife Refuge*Pablo National Wildlife Refuge*Swan River National Wildlife Refuge-Demographics:...

, Sanders

Sanders County, Montana

Sanders County is a county located in the U.S. state of Montana. As of 2010, the population was 11,413. Its county seat is Thompson Falls.-Geography:According to the U.S...

, Missoula

Missoula County, Montana

-National protected areas:*Bitterroot National Forest *Flathead National Forest *Lolo National Forest *Rattlesnake National Recreation Area-Demographics:...

, and Flathead

Flathead County, Montana

-National protected areas:* Pacific Northwest National Scenic Trail * Flathead National Forest * Glacier National Park * Kootenai National Forest * Lolo National Forest * Lost Trail National Wildlife Refuge-Demographics:...

 counties.

Bureau of Land Management

The Bureau of Land Management

Bureau of Land Management

The Bureau of Land Management is an agency within the United States Department of the Interior which administers America's public lands, totaling approximately , or one-eighth of the landmass of the country. The BLM also manages of subsurface mineral estate underlying federal, state and private...

 (BLM) includes Montana with North and South Dakota in its Montana-Dakotas region.
The BLM administers Montana through nine regional field offices.

• Billings office
• Butte office
• Dillon office
• Glasgow office
• Havre office
• Lewistown office
• Malta office
• Miles City office
• Missoula office

National Weather Service

Montana is part of the Western Region of the U.S. Department of Commerce, National Oceanic and Atmospheric Administration

National Oceanic and Atmospheric Administration

The National Oceanic and Atmospheric Administration , pronounced , like "noah", is a scientific agency within the United States Department of Commerce focused on the conditions of the oceans and the atmosphere...

's National Weather Service

National Weather Service

The National Weather Service , once known as the Weather Bureau, is one of the six scientific agencies that make up the National Oceanic and Atmospheric Administration of the United States government...

 (NWS). The NWS maintains four regional offices in Montana.

• Billings
• Glasgow
• Great Falls
• Missoula

Social Security Administration

Montana is included in the Denver Region of the Social Security Administration

Social Security Administration

The United States Social Security Administration is an independent agency of the United States federal government that administers Social Security, a social insurance program consisting of retirement, disability, and survivors' benefits...

 along with Colorado, North Dakota, South Dakota, Wyoming and Utah.

U.S. Army Corps of Engineers

Montana is included in the Omaha District of the U.S. Army Corps of Engineers

United States Army Corps of Engineers

The United States Army Corps of Engineers is a federal agency and a major Army command made up of some 38,000 civilian and military personnel, making it the world's largest public engineering, design and construction management agency...

Northwestern Division.