Montana County Maps: Interactive History & Complete List

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Map of Montana Counties
Map of Montana county boundaries and county seats.

Maps of Montana are an invaluable area of genealogy and family history research, notably if you live far from where your ancestor was living.

Due to the fact that Montana’s political boundaries have frequently changed over the years, historic maps are significant in helping you uncover the precise location of your ancestor’s hometown, just what land they owned, who their neighbors ended up being, and much more besides.

Maps of Montana are an outstanding source for getting started with your research, given that they provide you with excellent information and facts instantly and in a clear format.

Montana maps are helpful when it comes to researching your family background, especially considering that some of the local towns no longer exist. Numerous types of maps can be sourced which will help in finding land, mining claims, ghost cities, or ranches.

Montana borders North Dakota, Idaho, Wyoming, South Dakota, British Columbia, Canada, and Alberta, Canada to the north. Montana’s 10 largest cities are Billings, Missoula, Great Falls, Bozeman, Butte-Silver Bow, Helena, Kalispell, Havre, Anaconda–Deer Lodge County, and Miles City.

Learn more historical facts about Montana counties here.

Interactive Map of Montana County Formation History

AniMap Plus 3.0, with the permission of the Goldbug Company


List of Every Montana County

Beaverhead County

Located in the southwestern part of the state, Beaverhead County was established in 1865 and has a population of approximately 9,200.

Big Horn County

Big Horn County was established in 1913 and is located in the southern part of Montana. Its population is around 13,000.

Blaine County

Founded in 1912, Blaine County is located in north-central Montana and has about 6,500 residents.

Broadwater County

Broadwater County is situated in west-central Montana and was established in 1897. It is home to around 6,200 people.

Carbon County

Located in south-central Montana, Carbon County was founded in 1895 and has a population of approximately 10,500.

Carter County

Carter County is in southeastern Montana and was established in 1917. Its population is around 1,200.

Cascade County

Established in 1887, Cascade County is situated in west-central Montana and has a population of approximately 81,000.

Chouteau County

Chouteau County is located in north-central Montana and was founded in 1865. It has around 5,500 residents.

Custer County

Custer County was founded in 1865 and is located in southeastern Montana. Its population is around 12,000.

Daniels County

Situated in northeastern Montana, Daniels County was established in 1920 and is home to about 1,600 people.

Dawson County

Dawson County is located in eastern Montana and was founded in 1864. Its population is around 9,000.

Deer Lodge County

Established in 1864, Deer Lodge County is located in southwestern Montana and has a population of approximately 9,000.

Fallon County

Fallon County is in southeastern Montana and was established in 1913. Its population is around 3,100.

Fergus County

Situated in central Montana, Fergus County was established in 1885 and has a population of approximately 11,000.

Flathead County

Founded in 1893, Flathead County is located in northwestern Montana and has a population of around 104,000.

Gallatin County

Gallatin County is located in south-central Montana and was established in 1865. It is home to around 118,000 people.

Garfield County

Garfield County is in southeastern Montana and was founded in 1919. Its population is around 1,200.

Glacier County

Located in northwestern Montana, Glacier County was established in 1919 and has approximately 14,000 residents.

Golden Valley County

Established in 1920, Golden Valley County is situated in central Montana and has a population of around 800.

Granite County

Located in west-central Montana, Granite County was founded in 1893 and has a population of approximately 3,100.

Hill County

Hill County is located in north-central Montana and was established in 1912. It has around 16,000 residents.

Jefferson County

Established in 1864, Jefferson County is situated in west-central Montana and is home to approximately 12,000 people.

Judith Basin County

Judith Basin County is located in central Montana and was established in 1920. Its population is around 2,000.

Lake County

Lake County is situated in northwestern Montana and was founded in 1923. Its population is around 31,000.

Lewis and Clark County

Established in 1864, Lewis and Clark County is located in west-central Montana and has approximately 69,000 residents.

Liberty County

Liberty County is in north-central Montana and was established in 1920. Its population is around 2,000.

Lincoln County

Located in northwestern Montana, Lincoln County was founded in 1909 and has a population of approximately 20,000.

Madison County

Madison County is situated in southwestern Montana and was established in 1864. Its population is around 8,000.

McCone County

McCone County is located in northeastern Montana and was established in 1919. It has around 1,600 residents.

Meagher County

Founded in 1867, Meagher County is located in west-central Montana and has a population of approximately 1,900.

Mineral County

Mineral County is situated in western Montana and was established in 1914. Its population is around 4,300.

Missoula County

Established in 1860, Missoula County is located in western Montana and is home to approximately 120,000 people.

Musselshell County

Musselshell County is situated in central Montana and was founded in 1911. Its population is around 4,500.

Park County

Located in south-central Montana, Park County was established in 1887 and has approximately 17,000 residents.

Petroleum County

Petroleum County is in central Montana and was founded in 1925. Its population is around 450.

Phillips County

Phillips County is located in north-central Montana and was founded in 1915. Its population is around 4,000.

Pondera County

Established in 1919, Pondera County is situated in north-central Montana and has approximately 6,000 residents.

Powder River County

Powder River County is located in southeastern Montana and was founded in 1919. It is home to around 1,600 people.

Powell County

Powell County is located in western Montana and was established in 1901. Its population is roughly 7,000.

Prairie County

Founded in 1915, Prairie County is located in southeastern Montana and has approximately 1,100 residents.

Ravalli County

Established in 1893, Ravalli County is situated in western Montana and has a population of approximately 45,000.

Richland County

Richland County is located in northeastern Montana and was established in 1914. Its population is around 11,000.

Roosevelt County

Founded in 1919, Roosevelt County is located in northeastern Montana and is home to approximately 11,000 people.

Rosebud County

Rosebud County is situated in southeastern Montana and was established in 1901. Its population is around 9,000.

Sanders County

Established in 1905, Sanders County is located in western Montana and has approximately 11,000 residents.

Sheridan County

Sheridan County is located in northeastern Montana and was established in 1913. Its population is around 3,500.

Silver Bow County

Founded in 1881, Silver Bow County is situated in southwestern Montana and has a population of approximately 35,000.

Stillwater County

Stillwater County is located in south-central Montana and was established in 1913. It is home to around 9,500 people.

Sweet Grass County

Sweet Grass County is situated in south-central Montana and was established in 1895. Its population is around 3,700.

Teton County

Founded in 1893, Teton County is located in north-central Montana and has a population of approximately 6,000.

Toole County

Toole County is located in northwestern Montana and was established in 1914. It has around 5,000 residents.

Treasure County

Treasure County is situated in south-central Montana and was established in 1919. Its population is around 700.

Valley County

Founded in 1893, Valley County is located in north-central Montana and has a population of approximately 7,500.

Wheatland County

Wheatland County is situated in central Montana and was established in 1917. Its population is around 2,000.

Wibaux County

Wibaux County is located in southeastern Montana and was founded in 1914. Its population is around 1,000.

Yellowstone County

Established in 1883, Yellowstone County is situated in south-central Montana and has approximately 162,000 residents.

Old Antique Atlases & Maps of Montana

Disclaimer: All Montana maps are free to use for your own genealogical purposes and may not be reproduced for resale or distribution.

Source: David Rumsey Historical Map Collection

  • 1880 Territory of Montana

    1880 Territory of Montana

    Shows counties, settlements, townships, Indian reservations, railroads, rivers, etc. Prime meridians: Greenwich and Washington.

  • 1880 Map of Oregon, Washington, Idaho, and part of Montana

    1880 Map of Oregon, Washington, Idaho, and part of Montana

    Shows settlements, railroad, rivers, etc. Prime meridians: Greenwich and Washington.

Montana Map Links

Caleb Pike
About the author

Caleb Pike is an avid hiker and nature lover, with a passion for exploring the great outdoors. He's a writer, photographer, and adventurer, always seeking new trails to blaze and peaks to conquer.