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List of counties in Montana

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There are 56 counties in the U.S. state of Montana. Montana has two consolidated city-counties—Anaconda with Deer Lodge County and Butte with Silver Bow County. The portion of Yellowstone National Park that is in Montana was not part of any county until 1978. Then part of it was added to Gallatin County, and the rest of it to Park County.

Montana's postal abbreviation is MT and its FIPS state code is 30.

Counties

County
FIPS code[1]County seat[2]Established[2]OriginNaming HistoryPopulation
(2020)[2]		Area[2]Map
Beaverhead County001DillonFebruary 2, 1865Original CountyBeaverhead Rock in the Jefferson River, which is shaped like a beaver's head.[3]9,3715,543 sq mi
(14,356 km2)
Big Horn County003HardinJanuary 13, 1913Rosebud County, Yellowstone CountyBighorn sheep in the area.[4][5]13,1244,995 sq mi
(12,937 km2)
Blaine County005ChinookFebruary 29, 1912Chouteau CountyJames G. Blaine (1830–1893), United States Secretary of State and presidential candidate.[6]7,0444,226 sq mi
(10,945 km2)
Broadwater County007TownsendFebruary 9, 1897Jefferson County, Meagher CountyCharles A. Broadwater (1840–1892), a pioneer in the area and colonel in the United States Army.[7]6,7741,192 sq mi
(3,087 km2)
Carbon County009Red LodgeMarch 4, 1895Park County, Yellowstone CountyCoal deposits in the area.[5]10,4732,048 sq mi
(5,304 km2)
Carter County011EkalakaFebruary 22, 1917Fallon CountyThomas Henry Carter (1854–1911), a U.S. Senator from Montana.[8]1,4153,049 sq mi
(7,897 km2)
Cascade County013Great FallsSeptember 12, 1887Chouteau County, Meagher CountyGreat Falls of the Missouri River.84,4142,698 sq mi
(6,988 km2)
Chouteau County015Fort BentonFebruary 2, 1865Original CountyJean Pierre Chouteau (1758–1849) and his son Pierre Chouteau, Jr. (1789–1865). They were part of the Chouteau fur-trading family.5,8953,973 sq mi
(10,290 km2)
Custer County017Miles CityFebruary 2, 1865Original CountyOriginally Big Horn County,[9] renamed February 16, 1877 for George Armstrong Custer11,8673,783 sq mi
(9,798 km2)
Daniels County019ScobeyAugust 30, 1920Sheridan County, Valley CountyMansfield A. Daniels (1858 - 1919), an early rancher and storekeeper1,6611,426 sq mi
(3,693 km2)
Dawson County021GlendiveJanuary 15, 1869Unorganized landsAndrew Dawson, a trapping official and major in the United States Army8,9402,373 sq mi
(6,146 km2)
Deer Lodge County023AnacondaFebruary 2, 1865Original CountyDeer Lodge Valley, which in turn was either named for the Native American name "Lodge of the White-tailed Deer" or a salt lick where deer came in droves9,421737 sq mi
(1,909 km2)
Fallon County025BakerDecember 9, 1913Custer CountyBenjamin O'Fallon, a Federal Native American agent3,0491,620 sq mi
(4,196 km2)
Fergus County027LewistownMarch 12, 1885Chouteau County, Meagher CountyAndrew Fergus (1850 - 1928), one of the first settlers in the county11,4464,339 sq mi
(11,238 km2)
Flathead County029KalispellFebruary 6, 1893Missoula CountyFlathead Native Americans104,3575,099 sq mi
(13,206 km2)
Gallatin County031BozemanFebruary 2, 1865Original CountyAlbert Gallatin (1761–1849), the United States Secretary of the Treasury at the time of the Lewis and Clark Expedition118,9602,507 sq mi
(6,493 km2)
Garfield County033JordanFebruary 7, 1919Dawson CountyJames A. Garfield (1831–1881), the twentieth President of the United States1,1734,668 sq mi
(12,090 km2)
Glacier County035Cut BankFebruary 17, 1919Teton CountyGlacier National Park, which borders the county13,7782,995 sq mi
(7,757 km2)
Golden Valley County037RyegateOctober 4, 1920Musselshell County, Sweet Grass CountyProbably named in a promotional attempt to lure settlers to the area8231,175 sq mi
(3,043 km2)
Granite County039PhilipsburgMarch 2, 1893Deer Lodge County, Missoula CountyNamed for the granite rock which is common in the area's mountains and also held the area's rich gold and silver ore; the old mining town of Granite shared the name.[10]3,3091,728 sq mi
(4,475 km2)
Hill County041HavreFebruary 22, 1912Chouteau CountyJames J. Hill (1838–1916), a leading railroad tycoon16,3092,896 sq mi
(7,501 km2)
Jefferson County043BoulderFebruary 2, 1865Original CountyThomas Jefferson (1743–1826), the third President of the United States12,0851,657 sq mi
(4,292 km2)
Judith Basin County045StanfordDecember 10, 1920Cascade County, Fergus CountyThe Judith River which was in turn named by William Clark for Julia "Judith" Hancock, whom he would later marry2,0231,870 sq mi
(4,843 km2)
Lake County047PolsonMay 11, 1923Flathead County, Missoula CountyFlathead Lake31,1341,494 sq mi
(3,869 km2)
Lewis and Clark County049HelenaFebruary 2, 1865Original CountyOriginally Edgerton County), renamed March 1, 1868 for Meriwether Lewis and William Clark70,9733,461 sq mi
(8,964 km2)
Liberty County051ChesterFebruary 11, 1920Chouteau County, Hill CountyThe sentiment of the inhabitants when the county was formed soon after World War I1,9591,430 sq mi
(3,704 km2)
Lincoln County053LibbyMarch 9, 1909Flathead CountyAbraham Lincoln (1809–1865), the 16th President of the United States19,6773,613 sq mi
(9,358 km2)
McCone County055CircleFebruary 20, 1919Dawson County, Richland CountyGeorge McCone (1853 - 1929), a Montana state senator who helped create the county1,7292,643 sq mi
(6,845 km2)
Madison County057Virginia CityFebruary 2, 1865Original CountyJames Madison (1751–1836), the fourth President of the United States and the Secretary of State at the time of the Lewis and Clark Expedition8,6233,587 sq mi
(9,290 km2)
Meagher County059White Sulphur SpringsNovember 16, 1867Chouteau County, Gallatin CountyThomas Francis Meagher (1823–1867), an acting Governor of the Montana Territory1,9272,392 sq mi
(6,195 km2)
Mineral County061SuperiorAugust 7, 1914Missoula CountyMany mines and mining prospects within the county4,5351,220 sq mi
(3,160 km2)
Missoula County063MissoulaFebruary 2, 1865Original CountySupposedly a contraction of the Flathead word, "im-i-sul-e-etiku", meaning "by or near the place of fear or ambush", a reference to Hell Gate Canyon, in which Flathead Native Americans were sometimes attacked by Blackfeet117,9222,598 sq mi
(6,729 km2)
Musselshell County065RoundupFebruary 11, 1911Fergus County, Meagher County, Yellowstone CountyThe Musselshell River, named in turn by the Lewis and Clark Expedition presumably due to mussels found on its banks4,7301,867 sq mi
(4,836 km2)
Park County067LivingstonFebruary 23, 1887Gallatin CountyNearby Yellowstone National Park17,1912,656 sq mi
(6,879 km2)
Petroleum County069WinnettNovember 24, 1924Fergus CountyThe production of petroleum at Cat Creek4961,654 sq mi
(4,284 km2)
Phillips County071MaltaFebruary 5, 1915Blaine County, Valley CountyBenjamin D. Phillips (1857 - 1926), a leading rancher and early pioneer in the county4,2175,140 sq mi
(13,313 km2)
Pondera County073ConradFebruary 17, 1919Chouteau County, Teton CountyOriginally pend d'oreille, French words meaning "ear pendant"; the name was changed to a form resembling the phonetic spelling to avoid confusion with the lake and town of the same name in Idaho and of a county in Washington.5,8981,625 sq mi
(4,209 km2)
Powder River County075BroadusMarch 7, 1919Custer CountyThe Powder River, named in turn for the gunpowder-like sand on its shores1,6943,297 sq mi
(8,539 km2)
Powell County077Deer LodgeJanuary 31, 1901Deer Lodge CountyMount Powell, which in turn was named for John Wesley Powell (1834–1902), the early environmentalist and explorer6,9462,326 sq mi
(6,024 km2)
Prairie County079TerryFebruary 5, 1915Dawson County, Fallon CountyThe county's location on the Great Plains1,0881,737 sq mi
(4,499 km2)
Ravalli County081HamiltonFebruary 16, 1893Missoula CountyAnthony Ravalli (1812–1884), a Jesuit missionary who came to the area in 184544,1742,394 sq mi
(6,200 km2)
Richland County083SidneyMay 27, 1914Dawson CountyNamed so as to depict fertile soil, in an attempt to lure in settlers11,4912,084 sq mi
(5,398 km2)
Roosevelt County085Wolf PointFebruary 18, 1919Sheridan CountyTheodore Roosevelt (1858–1919), the 26th President of the United States10,7942,356 sq mi
(6,102 km2)
Rosebud County087ForsythFebruary 11, 1901Custer CountyThe Rosebud River, which was named for the many wild roses along its banks8,3295,012 sq mi
(12,981 km2)
Sanders County089Thompson FallsFebruary 7, 1905Missoula CountyWilbur Fiske Sanders (1834–1905), a pioneer, vigilante, and U.S. Senator from Montana12,4002,762 sq mi
(7,154 km2)
Sheridan County091PlentywoodMarch 24, 1913Valley CountyPhilip Sheridan (1831–1888), Civil War general3,5391,677 sq mi
(4,343 km2)
Silver Bow County093ButteFebruary 16, 1881Deer Lodge CountySilver Bow Creek; there are multiple theories explaining how the creek was named35,133718 sq mi
(1,860 km2)
Stillwater County095ColumbusMarch 24, 1913Carbon County, Sweet Grass County, Yellowstone CountyStillwater River, ironically named for its very fast current8,9631,795 sq mi
(4,649 km2)
Sweet Grass County097Big TimberMarch 5, 1895Meagher County, Park County, Yellowstone CountyThe abundant sweet grass in the county3,6781,855 sq mi
(4,804 km2)
Teton County099ChoteauFebruary 7, 1893Chouteau CountyThe Teton Range which is in turn named for the French word for 'nipple', teton.6,2262,273 sq mi
(5,887 km2)
Toole County101ShelbyMay 7, 1914Hill County, Teton CountyJoseph Toole (1851–1929), the first and fourth Governor of Montana4,9711,911 sq mi
(4,949 km2)
Treasure County103HyshamFebruary 7, 1919Rosebud CountyNamed promotionally to attract new settlers762979 sq mi
(2,536 km2)
Valley County105GlasgowFebruary 6, 1893Dawson CountyMuch of the county lies within the valley of the Milk River7,5784,921 sq mi
(12,745 km2)
Wheatland County107HarlowtonFebruary 22, 1917Meagher County, Sweet Grass CountyThe many wheat fields in the county2,0691,423 sq mi
(3,686 km2)
Wibaux County109WibauxAugust 17, 1914Dawson County, Fallon County, Richland CountyPierre Wibaux (1858–1913), a pioneer and cattleman937889 sq mi
(2,302 km2)
Yellowstone County111BillingsFebruary 26, 1883Custer CountyThe Yellowstone River, named in turn for the yellow rocks found along its shores164,7312,635 sq mi
(6,825 km2)

References

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