De Amerikaanse staat Montana is onderverdeeld in 56 county's.
400px|right|thumb|County's van Montana
CountyInwonersU.S. Census Bureau: Annual Estimates of the Population for Counties: April 1, 2000 to July 1, 20071 juli 2007HoofdplaatsInwonersU.S. Census Bureau: Population Estimates for All Places: 2000 to 20071 juli 2007Beaverhead8804Dillon4106Big Horn12.798Hardin3468Blaine6550Chinook1285Broadwater4590Townsend1981Carbon9721Red Lodge2449Carter1268Ekalaka380Cascade81.775Great Falls58.827Chouteau5254Fort Benton1459Custer11.188Miles City8120Daniels1650Scobey894Dawson8558Glendive4615Deer Lodge8852Anaconda8852Fallon2696Baker1616Fergus11.181Lewistown5945Flathead86.844Kalispell20.298Gallatin87.359Bozeman37.981Garfield1215Jordan344Glacier13.382Cut Bank3125Golden Valley1125Ryegate293Granite2852Philipsburg922Hill16.568Havre9618Jefferson11.121Boulder1427Judith Basin2048Stanford399Lake28.438Polson5046Lewis and Clark59.998Helena28.726Liberty1796Chester731Lincoln18.885Libby2886Madison7426Virginia City141McCone1724Circle558Meagher1900White Sulphur Springs967Mineral3895Superior880Missoula105.650Missoula67.165Musselshell4494Roundup1916Park16.099Livingston7411Petroleum438Winnett164Phillips3948Malta1820Pondera5943Conrad2540Powder River1699Broadus444Powell7118Deer Lodge3502Prairie1044Terry534Ravalli40.396Hamilton4691Richland9182Sidney4746Roosevelt10.148Wolf Point2525Rosebud9182Forsyth1880Sanders11.033Thompson Falls1423Sheridan3373Plentywood1702Silver Bow32.652Butte31.967Stillwater8660Columbus1934Sweet Grass3807Big Timber1801Teton6023Choteau1694Toole5144Shelby3417Treasure651Hysham248Valley6899Glasgow2922Wheatland1983Harlowton911Wibaux898Wibaux481Yellowstone139.936Billings101.876
Montana