# List of counties in Montana

This is a list of the counties in the U.S. state of Montana. There are 56 counties in the state.
Montana has two consolidated city-counties—Anaconda with Deer Lodge County and Butte with Silver Bow County. The portion of Yellowstone National Park that lies within Montana was not part of any county until 1978, when part of it was nominally 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

The Federal Information Processing Standard (FIPS) code, which is used by the United States government to uniquely identify counties, is provided for each county. The FIPS code for each county links to census data for that county.
| County | FIPS code | County seat | Est. | Origin | Etymology | License plate prefix | Population | Area |
| Beaverhead County | 001 | Dillon | Feb 2, 1865 | Original County | Beaverhead Rock in the Jefferson River, which is shaped like a beaver's head. | 18 | 10,006 | 5,543 sq mi (14,356 km$^2$) |
| Big Horn County | 003 | Hardin | Jan 13, 1913 | Rosebud County, Yellowstone County | Bighorn sheep in the area. | 22 | 12,796 | 4,995 sq mi (12,937 km$^2$) |
| Blaine County | 005 | Chinook | Feb 29, 1912 | Chouteau County | James G. Blaine (1830–1893), United States Secretary of State and presidential candidate. | 24 | 6,903 | 4,226 sq mi (10,945 km$^2$) |
| Broadwater County | 007 | Townsend | Feb 9, 1897 | Jefferson County, Meagher County | Charles A. Broadwater (1840–1892), a pioneer in the area and colonel in the United States Army. | 43 | 8,302 | 1,192 sq mi (3,087 km$^2$) |
| Carbon County | 009 | Red Lodge | Mar 4, 1895 | Park County, Yellowstone County | Coal deposits in the area. | 10 | 11,498 | 2,048 sq mi (5,304 km$^2$) |
| Carter County | 011 | Ekalaka | Feb 22, 1917 | Fallon County | Thomas Henry Carter (1854–1911), a U.S. Senator from Montana. | 42 | 1,399 | 3,340 sq mi (8,651 km$^2$) |
| Cascade County | 013 | Great Falls | Sep 12, 1887 | Chouteau County, Meagher County | Great Falls of the Missouri River. | 2 | 84,523 | 2,698 sq mi (6,988 km$^2$) |
| Chouteau County | 015 | Fort Benton | Feb 2, 1865 | Original County | Jean Pierre Chouteau (1758–1849) and his son Pierre Chouteau, Jr. (1789–1865). They were part of the Chouteau fur-trading family. | 19 | 5,880 | 3,973 sq mi (10,290 km$^2$) |
| Custer County | 017 | Miles City | Feb 2, 1865 | Original County | Originally Big Horn County, renamed February 16, 1877 for George Armstrong Custer | 14 | 11,964 | 3,783 sq mi (9,798 km$^2$) |
| Daniels County | 019 | Scobey | Aug 30, 1920 | Sheridan County, Valley County | Mansfield A. Daniels (1858 - 1919), an early rancher and storekeeper | 37 | 1,625 | 1,426 sq mi (3,693 km$^2$) |
| Dawson County | 021 | Glendive | Jan 15, 1869 | Unorganized lands | Andrew Dawson, a trapping official and major in the United States Army | 16 | 8,731 | 2,373 sq mi (6,146 km$^2$) |
| Deer Lodge County | 023 | Anaconda | Feb 2, 1865 | Original County | Deer 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 droves | 30 | 9,811 | 737 sq mi (1,909 km$^2$) |
| Fallon County | 025 | Baker | Dec 9, 1913 | Custer County | Benjamin O'Fallon, a Federal Native American agent | 39 | 2,946 | 1,620 sq mi (4,196 km$^2$) |
| Fergus County | 027 | Lewistown | Mar 12, 1885 | Chouteau County, Meagher County | Andrew Fergus (1850 - 1928), one of the first settlers in the county | 8 | 11,862 | 4,339 sq mi (11,238 km$^2$) |
| Flathead County | 029 | Kalispell | Feb 6, 1893 | Missoula County | Flathead Native Americans | 7 | 114,527 | 5,099 sq mi (13,206 km$^2$) |
| Gallatin County | 031 | Bozeman | Feb 2, 1865 | Original County | Albert Gallatin (1761–1849), the United States Secretary of the Treasury at the time of the Lewis and Clark Expedition | 6 | 126,984 | 2,507 sq mi (6,493 km$^2$) |
| Garfield County | 033 | Jordan | Feb 7, 1919 | Dawson County | James A. Garfield (1831–1881), the twentieth President of the United States | 50 | 1,181 | 4,668 sq mi (12,090 km$^2$) |
| Glacier County | 035 | Cut Bank | Feb 17, 1919 | Teton County | Glacier National Park, which borders the county | 38 | 13,503 | 2,995 sq mi (7,757 km$^2$) |
| Golden Valley County | 037 | Ryegate | Oct 4, 1920 | Musselshell County, Sweet Grass County | Probably named in a promotional attempt to lure settlers to the area | 53 | 863 | 1,175 sq mi (3,043 km$^2$) |
| Granite County | 039 | Philipsburg | Mar 2, 1893 | Deer Lodge County, Missoula County | Named 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. | 46 | 3,602 | 1,728 sq mi (4,475 km$^2$) |
| Hill County | 041 | Havre | Feb 22, 1912 | Chouteau County | James J. Hill (1838–1916), a leading railroad tycoon | 12 | 16,065 | 2,896 sq mi (7,501 km$^2$) |
| Jefferson County | 043 | Boulder | Feb 2, 1865 | Original County | Thomas Jefferson (1743–1826), the third President of the United States | 51 | 13,304 | 1,657 sq mi (4,292 km$^2$) |
| Judith Basin County | 045 | Stanford | Dec 10, 1920 | Cascade County, Fergus County | The Judith River which was in turn named by William Clark for Julia "Judith" Hancock, whom he would later marry | 36 | 2,111 | 1,870 sq mi (4,843 km$^2$) |
| Lake County | 047 | Polson | May 11, 1923 | Flathead County, Missoula County | Flathead Lake | 15 | 33,403 | 1,494 sq mi (3,869 km$^2$) |
| Lewis and Clark County | 049 | Helena | Feb 2, 1865 | Original County | Originally Edgerton County), renamed March 1, 1868 for Meriwether Lewis and William Clark | 5 | 75,129 | 3,461 sq mi (8,964 km$^2$) |
| Liberty County | 051 | Chester | Feb 11, 1920 | Chouteau County, Hill County | The sentiment of the inhabitants when the county was formed soon after World War I | 48 | 1,934 | 1,430 sq mi (3,704 km$^2$) |
| Lincoln County | 053 | Libby | Mar 9, 1909 | Flathead County | Abraham Lincoln (1809–1865), the 16th President of the United States | 56 | 22,184 | 3,613 sq mi (9,358 km$^2$) |
| Madison County | 057 | Virginia City | Feb 2, 1865 | Original County | James Madison (1751–1836), the fourth President of the United States and the Secretary of State at the time of the Lewis and Clark Expedition | 25 | 9,753 | 3,587 sq mi (9,290 km$^2$) |
| McCone County | 055 | Circle | Feb 20, 1919 | Dawson County, Richland County | George McCone (1853 - 1929), a Montana state senator who helped create the county | 41 | 1,717 | 2,643 sq mi (6,845 km$^2$) |
| Meagher County | 059 | White Sulphur Springs | Nov 16, 1867 | Chouteau County, Gallatin County | Thomas Francis Meagher (1823–1867), an acting Governor of the Montana Territory | 47 | 2,065 | 2,392 sq mi (6,195 km$^2$) |
| Mineral County | 061 | Superior | Aug 7, 1914 | Missoula County | Many mines and mining prospects within the county | 54 | 5,195 | 1,220 sq mi (3,160 km$^2$) |
| Missoula County | 063 | Missoula | Feb 2, 1865 | Original County | Supposedly 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 Blackfeet | 4 | 122,546 | 2,598 sq mi (6,729 km$^2$) |
| Musselshell County | 065 | Roundup | Feb 11, 1911 | Fergus County, Meagher County, Yellowstone County | The Musselshell River, named in turn by the Lewis and Clark Expedition presumably due to mussels found on its banks | 23 | 5,452 | 1,867 sq mi (4,836 km$^2$) |
| Park County | 067 | Livingston | Feb 23, 1887 | Gallatin County | Nearby Yellowstone National Park | 49 | 18,074 | 2,656 sq mi (6,879 km$^2$) |
| Petroleum County | 069 | Winnett | Nov 24, 1924 | Fergus County | The production of petroleum at Cat Creek | 55 | 525 | 1,654 sq mi (4,284 km$^2$) |
| Phillips County | 071 | Malta | Feb 5, 1915 | Blaine County, Valley County | Benjamin D. Phillips (1857 - 1926), a leading rancher and early pioneer in the county | 11 | 4,214 | 5,140 sq mi (13,313 km$^2$) |
| Pondera County | 073 | Conrad | Feb 17, 1919 | Chouteau County, Teton County | Originally 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. | 26 | 6,078 | 1,625 sq mi (4,209 km$^2$) |
| Powder River County | 075 | Broadus | Mar 7, 1919 | Custer County | The Powder River, named in turn for the gunpowder-like sand on its shores | 9 | 1,734 | 3,297 sq mi (8,539 km$^2$) |
| Powell County | 077 | Deer Lodge | Jan 31, 1901 | Deer Lodge County | Mount Powell, which in turn was named for John Wesley Powell (1834–1902), the early environmentalist and explorer | 28 | 7,120 | 2,326 sq mi (6,024 km$^2$) |
| Prairie County | 079 | Terry | Feb 5, 1915 | Dawson County, Fallon County | The county's location on the Great Plains | 45 | 1,112 | 1,737 sq mi (4,499 km$^2$) |
| Ravalli County | 081 | Hamilton | Feb 16, 1893 | Missoula County | Anthony Ravalli (1812–1884), a Jesuit missionary who came to the area in 1845 | 13 | 48,187 | 2,394 sq mi (6,200 km$^2$) |
| Richland County | 083 | Sidney | May 27, 1914 | Dawson County | Named so as to depict fertile soil, in an attempt to lure in settlers | 27 | 11,028 | 2,084 sq mi (5,398 km$^2$) |
| Roosevelt County | 085 | Wolf Point | Feb 18, 1919 | Sheridan County | Theodore Roosevelt (1858–1919), the 26th President of the United States | 17 | 10,197 | 2,356 sq mi (6,102 km$^2$) |
| Rosebud County | 087 | Forsyth | Feb 11, 1901 | Custer County | The Rosebud River, which was named for the many wild roses along its banks | 29 | 8,194 | 5,012 sq mi (12,981 km$^2$) |
| Sanders County | 089 | Thompson Falls | Feb 7, 1905 | Missoula County | Wilbur Fiske Sanders (1834–1905), a pioneer, vigilante, and U.S. Senator from Montana | 35 | 13,895 | 2,762 sq mi (7,154 km$^2$) |
| Sheridan County | 091 | Plentywood | Mar 24, 1913 | Valley County | Philip Sheridan (1831–1888), Civil War general | 34 | 3,448 | 1,677 sq mi (4,343 km$^2$) |
| Silver Bow County | 093 | Butte | Feb 16, 1881 | Deer Lodge County | Silver Bow Creek; there are multiple theories explaining how the creek was named | 1 | 36,134 | 718 sq mi (1,860 km$^2$) |
| Stillwater County | 095 | Columbus | Mar 24, 1913 | Carbon County, Sweet Grass County, Yellowstone County | Stillwater River, ironically named for its very fast current | 32 | 9,450 | 1,795 sq mi (4,649 km$^2$) |
| Sweet Grass County | 097 | Big Timber | Mar 5, 1895 | Meagher County, Park County, Yellowstone County | The abundant sweet grass in the county | 40 | 3,757 | 1,855 sq mi (4,804 km$^2$) |
| Teton County | 099 | Choteau | Feb 7, 1893 | Chouteau County | The Teton Range which is in turn named for the French word for 'nipple', teton | 31 | 6,444 | 2,273 sq mi (5,887 km$^2$) |
| Toole County | 101 | Shelby | May 7, 1914 | Hill County, Teton County | Joseph Toole (1851–1929), the first and fourth Governor of Montana | 21 | 5,153 | 1,911 sq mi (4,949 km$^2$) |
| Treasure County | 103 | Hysham | Feb 7, 1919 | Rosebud County | Named promotionally to attract new settlers | 33 | 739 | 979 sq mi (2,536 km$^2$) |
| Valley County | 105 | Glasgow | Feb 6, 1893 | Dawson County | Much of the county lies within the valley of the Milk River | 20 | 7,434 | 4,921 sq mi (12,745 km$^2$) |
| Wheatland County | 107 | Harlowton | Feb 22, 1917 | Meagher County, Sweet Grass County | The many wheat fields in the county | 44 | 2,058 | 1,423 sq mi (3,686 km$^2$) |
| Wibaux County | 109 | Wibaux | Aug 17, 1914 | Dawson County, Fallon County, Richland County | Pierre Wibaux (1858–1913), a pioneer and cattleman | 52 | 911 | 889 sq mi (2,302 km$^2$) |
| Yellowstone County | 111 | Billings | Feb 26, 1883 | Custer County | The Yellowstone River, named in turn for the yellow rocks found along its shores | 3 | 171,583 | 2,635 sq mi (6,825 km$^2$) |

### Previous counties

* St. Charles County, Missouri Territory created October 1, 1812, moved 1813
* Vancouver County, Oregon Territory created August 13, 1848, renamed Clarke County, Oregon Territory September 3, 1849
* Clarke County, Washington Territory created March 2, 1853
* Walla Walla County, Washington Territory April 25, 1854
* Spokane County, Washington Territory created January 29, 1858, abolished January 19, 1864
* Missoula County, Washington Territory created December 14, 1860, abolished May 26, 1864
* Shoshone County, Washington Territory created January 9, 1861, abolished March 3, 1863
* Stevens County, Washington Territory created January 20, 1863
* Shoshone County, Idaho Territory created February 4, 1864

### Extinct counties

* Edgerton County, Montana Territory created February 2, 1865, renamed Lewis and Clark County, Montana Territory March 1, 1868.
* Big Horn County, Montana Territory created February 2, 1865, renamed Custer County, Montana Territory February 16, 1877.

### County equivalents

* Yellowstone National Park (Montana Territory) created March 1, 1872, divided between Park County, Montana and Gallatin County, Montana in 1978.