![]() To Montana Counties, MT-AHGP |
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| County | Date | Parent County | County Seat |
|---|---|---|---|
| 1865 | One of the | Dillon | |
| 1913 | Rosebud & | Hardin | |
| 1912 | Choteau | Chinook | |
| 1895 | Jefferson & | Townsend | |
| 1895 | Park & | Red Lodge | |
| 1917 | Fallon | Ekalaka | |
| 1887 | Chouteau & | Great Falls | |
| Chouteau ("Show-toe") | 1865 | One of the | Fort Benton |
Custer | 1877 | Big Horn | Miles City |
| 1920 | Sheridan & | Scobey | |
| 1869 | An original county | Glendive | |
| 1865 | One of the | Anaconda | |
| 1913 | Custer | Baker | |
| 1886 | One of | Lewistown | |
| 1893 | Missoula | Kalispell | |
| Gallatin Co MT CC-#-1- Judy White Gallatin | 1865 | One of the | Bozeman |
| 1919 | Dawson | Jordan | |
| 1919 | Teton | Cutbank | |
| 1920 | Musselshell & | Ryegate | |
| 1893 | Deer Lodge & | Philipsburg | |
| 1912 | Chouteau | Havre | |
| 1865 | One of the | Boulder | |
| 1920 | Cascade & | Stanford | |
| 1923 | Flathead & | Polson | |
| 1865 | One of the | Helena | |
| 1920 | Chouteau & | Chester | |
| 1909 | Flathead | Libby | |
| 1919 | Dawson & | Circle | |
| 1865 | One of the | Virginia City | |
| 1867 | Chouteau & | White Sulfur Springs | |
| 1914 | Missoula | Superior | |
| 1865 | One of the | Missoula | |
| 1911 | Fergus, Meagher & | Roundup | |
| 1887 | Gallatin | Livingston | |
| 1925 | Fergus | Winnett | |
| 1915 | Blaine & | Malta | |
| 1919 | Choteau & | Conrad | |
| 1919 | Custer | Broadus | |
| Powell | 1901 | Deer Lodge | Deer Lodge |
| 1915 | Dawson & | Terry | |
| 1893 | Missoula | Hamilton | |
| 1914 | Dawson | Sidney | |
| 1919 | Sheridan | Wolf Point | |
| 1901 | Custer | Forsyth | |
| 1905 | Missoula | Thompson Falls | |
| Sheridan | 1913 | Valley | Plentywood |
| Silverbow | 1881 | Deer Lodge | Butte |
| 1913 | Carbon, Sweetgrass & | Columbus | |
| 1895 | Meagher, Park & | Big Timber | |
| 1893 | Chouteau | Choteau | |
| Toole | 1914 | Hill & | Shelby |
| 1919 | Rosebud | Hysham | |
| 1893 | Dawson | Glasgow | |
| Wheatland Co MT CC #-1-Teri Cleaveland Wheatland | 1917 | Meagher & | Harlowton |
| Wibaux ("Wee-boe") | 1914 | Dawson, Fallon & | Wibaux |
| 1883 | Custer | Billings |
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