How many counties in Montana? All 56 listed
Quick answer
Montana has 56 counties and county equivalents holding 1,105,072 residents. The most populous county in Montana is Yellowstone County with 167,340 residents; the smallest is Petroleum County. County boundaries divide the state's land area — measured in square miles by the Census Bureau — into the units used for property assessment, elections and local sales tax. The statewide sales tax base rate is 0%, before county and city add-ons.
All 56 counties
Ranked by population, Census 2019-2023 ACS 5-year estimates.
| County | Population | Median income | Median home value | Median rent |
|---|---|---|---|---|
| Yellowstone County | 167,340 | $74,400 | $317,600 | $1,084 |
| Gallatin County | 122,194 | $87,454 | $604,900 | $1,574 |
| Missoula County | 119,639 | $71,246 | $423,100 | $1,125 |
| Flathead County | 108,445 | $71,327 | $467,700 | $1,094 |
| Cascade County | 84,601 | $66,203 | $243,300 | $902 |
| Lewis and Clark County | 72,580 | $74,543 | $358,200 | $1,062 |
| Ravalli County | 45,807 | $71,323 | $435,000 | $1,054 |
| Silver Bow County | 35,589 | $57,504 | $223,500 | $810 |
| Lake County | 32,073 | $61,965 | $369,200 | $884 |
| Lincoln County | 20,656 | $47,018 | $258,700 | $810 |
| Park County | 17,484 | $66,607 | $429,700 | $927 |
| Hill County | 16,260 | $55,313 | $187,600 | $752 |
| Glacier County | 13,713 | $45,129 | $153,400 | $553 |
| Big Horn County | 12,963 | $56,680 | $148,200 | $686 |
| Sanders County | 12,936 | $54,035 | $323,800 | $774 |
| Jefferson County | 12,501 | $76,576 | $408,000 | $886 |
| Custer County | 11,938 | $63,585 | $204,200 | $918 |
| Fergus County | 11,581 | $59,731 | $202,700 | $868 |
| Richland County | 11,329 | $69,578 | $259,000 | $866 |
| Carbon County | 10,877 | $71,017 | $379,300 | $882 |
| Roosevelt County | 10,665 | $53,125 | $119,400 | $707 |
| Beaverhead County | 9,590 | $58,072 | $282,000 | $800 |
| Deer Lodge County | 9,512 | $49,533 | $209,700 | $661 |
| Stillwater County | 9,052 | $81,503 | $355,600 | $968 |
| Madison County | 8,975 | $67,420 | $440,500 | $1,159 |
| Dawson County | 8,874 | $70,953 | $187,400 | $823 |
| Rosebud County | 8,236 | $56,430 | $188,900 | $644 |
| Valley County | 7,540 | $64,515 | $198,600 | $769 |
| Broadwater County | 7,310 | $63,636 | $364,800 | $978 |
| Powell County | 7,029 | $63,432 | $255,700 | $770 |
| Blaine County | 6,997 | $65,050 | $124,900 | $689 |
| Teton County | 6,291 | $67,766 | $235,500 | $750 |
| Pondera County | 6,012 | $53,500 | $179,200 | $806 |
| Chouteau County | 5,888 | $56,927 | $185,100 | $485 |
| Musselshell County | 5,068 | $59,010 | $221,200 | $865 |
| Toole County | 5,028 | $53,693 | $187,400 | $753 |
| Mineral County | 4,796 | $61,117 | $313,600 | $746 |
| Phillips County | 4,224 | $58,156 | $175,000 | $623 |
| Sweet Grass County | 3,713 | $69,426 | $295,500 | $1,073 |
| Sheridan County | 3,677 | $63,654 | $111,600 | $749 |
| Granite County | 3,419 | $54,646 | $339,500 | $734 |
| Fallon County | 2,817 | $72,284 | $237,000 | $772 |
| Judith Basin County | 2,053 | $55,417 | $214,200 | $502 |
| Wheatland County | 2,049 | $47,054 | $172,700 | $741 |
| Meagher County | 1,979 | $56,215 | $244,400 | $871 |
| Liberty County | 1,968 | $53,264 | $116,800 | $668 |
| McCone County | 1,818 | $71,842 | $197,400 | $543 |
| Powder River County | 1,762 | $68,009 | $149,400 | $609 |
| Daniels County | 1,524 | $58,000 | $177,800 | $588 |
| Carter County | 1,361 | $52,171 | $176,600 | $731 |
| Prairie County | 1,251 | $45,192 | $167,100 | $827 |
| Wibaux County | 1,148 | $64,792 | $92,300 | $964 |
| Garfield County | 938 | $61,750 | $178,300 | $802 |
| Golden Valley County | 840 | $57,353 | $203,900 | $769 |
| Treasure County | 761 | $73,036 | $215,300 | $992 |
| Petroleum County | 401 | $59,318 | $173,700 | $769 |
Source: US Census Bureau, ACS 2019-2023 5-year estimates · rates as published for 2019-2023 ACS 5-year
Keep going
More Montana data.