Montana County Map With Cities
By Marko Visic · Updated Oct 5, 2026
Montana has 56 counties, covering 145,550 square miles of land. The Census Bureau estimates its population at 1,144,694 as of July 1, 2025. The largest county by land area is Beaverhead County; the most populous is Yellowstone County; the least populous is Petroleum County.
Tap or click any county for details. Need a printable version? Blank Montana map (PDF/PNG/SVG).
All 56 Montana counties
| County | FIPS code | Population (July 1, 2025) ▼ | Change since April 2020 | Land area (sq mi) | People per sq mi | Median household income (2020–2024) |
|---|---|---|---|---|---|---|
| Yellowstone County | 30111 | 172,692 | +4.8% | 2,633 | 66 | $76,570 |
| Gallatin County | 30031 | 128,740 | +8.2% | 2,605 | 49 | $93,528 |
| Missoula County | 30063 | 123,513 | +4.7% | 2,593 | 48 | $75,598 |
| Flathead County | 30029 | 115,429 | +10.6% | 5,087 | 23 | $73,925 |
| Cascade County | 30013 | 85,029 | +0.7% | 2,698 | 32 | $67,690 |
| Lewis and Clark County | 30049 | 75,331 | +6.1% | 3,458 | 22 | $78,237 |
| Ravalli County | 30081 | 48,582 | +10.0% | 2,391 | 20 | $71,283 |
| Silver Bow County | 30093 | 36,118 | +2.8% | 718 | 50 | $61,754 |
| Lake County | 30047 | 33,392 | +7.2% | 1,491 | 22 | $63,360 |
| Lincoln County | 30053 | 22,328 | +13.5% | 3,613 | 6 | $47,143 |
| Park County | 30067 | 18,214 | +5.9% | 2,802 | 6 | $70,047 |
| Hill County | 30041 | 16,167 | -0.7% | 2,899 | 6 | $52,798 |
| Sanders County | 30089 | 14,062 | +13.4% | 2,760 | 5 | $57,476 |
| Glacier County | 30035 | 13,463 | -2.3% | 2,995 | 4 | $46,875 |
| Jefferson County | 30043 | 13,329 | +10.3% | 1,657 | 8 | $95,490 |
| Big Horn County | 30003 | 12,752 | -2.8% | 4,998 | 3 | $58,750 |
| Custer County | 30017 | 12,034 | +1.5% | 3,783 | 3 | $70,605 |
| Fergus County | 30027 | 11,825 | +3.3% | 4,339 | 3 | $63,706 |
| Carbon County | 30009 | 11,466 | +9.5% | 2,048 | 6 | $80,261 |
| Richland County | 30083 | 11,377 | -1.0% | 2,085 | 5 | $73,084 |
| Roosevelt County | 30085 | 10,242 | -5.2% | 2,355 | 4 | $57,063 |
| Beaverhead County | 30001 | 10,043 | +7.2% | 5,543 | 2 | $61,268 |
| Madison County | 30057 | 10,026 | +16.3% | 3,588 | 3 | $75,250 |
| Deer Lodge County | 30023 | 9,709 | +3.0% | 737 | 13 | $57,527 |
| Stillwater County | 30095 | 9,445 | +5.4% | 1,797 | 5 | $84,732 |
| Dawson County | 30021 | 8,692 | -2.8% | 2,372 | 4 | $71,334 |
| Broadwater County | 30007 | 8,493 | +25.4% | 1,192 | 7 | $70,374 |
| Rosebud County | 30087 | 8,253 | -1.0% | 5,008 | 2 | $49,914 |
| Valley County | 30105 | 7,385 | -2.6% | 4,926 | 1 | $71,695 |
| Powell County | 30077 | 7,157 | +3.1% | 2,326 | 3 | $66,923 |
| Blaine County | 30005 | 6,860 | -2.6% | 4,228 | 2 | $64,813 |
| Teton County | 30099 | 6,496 | +4.3% | 2,272 | 3 | $70,430 |
| Pondera County | 30073 | 6,072 | +2.8% | 1,625 | 4 | $52,338 |
| Chouteau County | 30015 | 5,865 | -0.8% | 3,973 | 1 | $58,218 |
| Musselshell County | 30065 | 5,582 | +17.9% | 1,869 | 3 | $58,920 |
| Toole County | 30101 | 5,211 | +4.8% | 1,915 | 3 | $57,731 |
| Mineral County | 30061 | 5,185 | +14.5% | 1,220 | 4 | $63,450 |
| Phillips County | 30071 | 4,203 | -0.3% | 5,140 | 1 | $53,417 |
| Sweet Grass County | 30097 | 3,762 | +2.2% | 1,856 | 2 | $77,000 |
| Granite County | 30039 | 3,658 | +10.7% | 1,727 | 2 | $59,265 |
| Sheridan County | 30091 | 3,436 | -3.1% | 1,677 | 2 | $70,147 |
| Fallon County | 30025 | 2,959 | -3.0% | 1,621 | 2 | $76,250 |
| Judith Basin County | 30045 | 2,162 | +7.0% | 1,870 | 1 | $59,000 |
| Meagher County | 30059 | 2,137 | +11.0% | 2,392 | 1 | $71,932 |
| Wheatland County | 30107 | 2,100 | +1.4% | 1,422 | 1 | $49,489 |
| Liberty County | 30051 | 1,957 | -0.1% | 1,430 | 1 | $57,857 |
| Powder River County | 30075 | 1,781 | +5.1% | 3,298 | 1 | $67,045 |
| McCone County | 30055 | 1,720 | -0.5% | 2,642 | 1 | $69,375 |
| Daniels County | 30019 | 1,612 | -2.5% | 1,426 | 1 | $55,625 |
| Carter County | 30011 | 1,383 | -2.1% | 3,340 | 0 | $54,167 |
| Garfield County | 30033 | 1,148 | -1.9% | 4,677 | 0 | $69,583 |
| Prairie County | 30079 | 1,112 | +1.6% | 1,737 | 1 | $51,250 |
| Wibaux County | 30109 | 885 | -5.5% | 890 | 1 | $67,462 |
| Golden Valley County | 30037 | 844 | +2.2% | 1,174 | 1 | $58,333 |
| Treasure County | 30103 | 728 | -4.2% | 978 | 1 | $67,917 |
| Petroleum County | 30069 | 548 | +10.0% | 1,656 | 0 | $60,208 |
FIPS code: the Census Bureau’s five-digit county ID, a two-digit state code plus a three-digit county code. It is not a ZIP code.
How many counties does Montana have?
Montana has 56 counties covering 145,550 square miles. The state was admitted to the Union in 1889 as the 41st state.
The largest county by land area is Beaverhead County at 5,543 square miles, home to 10,043 residents. The most populous is Yellowstone County with 172,692 residents — a density of 66 people per square mile. At the other end of the scale, Petroleum County has 548 residents.
Montana’s capital is Helena, while the largest city is Billings.
Related resources
Download a printable outline of Montana’s county boundaries from our blank map of Montana page — available in SVG, PNG, and PDF.
Use the What County Am I In? tool to detect which Montana county a GPS location or address falls in, or the Address to County Lookup for batch input.
For demographic radius analysis, the Find ZIP Codes in Radius and Population Within Radius tools let you draw a circle around any Montana address and see every ZIP code and the total population inside.
Two SimpleMapLab studies cover Montana specifically: the 100-mile radius around Helena measures how much of the state lives within 100 miles of its capitol, and the loneliest town in Montana ranks the state’s most isolated inhabited place. The county-counts blog post puts Montana’s 56 counties in national context.
Frequently asked questions
- County Population Totals, Vintage 2025: estimates for July 1, 2025, released March 2026
- Gazetteer Files, 2026: county land and water area
- American Community Survey 5-Year Estimates, 2020–2024: median household income (table B19013)
- County boundaries on the map: US Atlas TopoJSON build of the US Census Bureau’s TIGER/Line shapefiles. All figures are US Census Bureau data in the public domain.