County Maps US

Montana County Map

Montana has 56 counties. Together they cover 145,550 sq mi of land and 1,144,694 people.

Neighbouring areas are given different colours so their shared borders read clearly. These colours carry no data.

Boundaries from the 2025 Census cartographic boundary file, generalised so that no point moves by more than half a pixel at this width. Select any area to open its page.
Counties
56
28th most of the 51 states and DC
Population
1,144,694
43rd largest
Land area
145,550
square miles
Density
7.9
people per square mile, computed

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025. Retrieved 30 August 2026.

Download this map

Free to use and redistribute. The boundaries are public-domain Census Bureau data; attribution to County Maps US is appreciated but not required.

Satellite view

Aerial imagery of Montana with the state boundary drawn on top. County lines are not drawn here: at this scale they would bury the picture, and the map above already carries them.

Aerial view of Montana from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 489 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

The extremes of Montana

Most populous

Yellowstone County

172,692

Least populous

Petroleum County

548

Largest by land area

Beaverhead County

5,543 sq mi

Smallest by land area

Silver Bow County

718 sq mi

Most densely populated

Yellowstone County

65.6 per sq mi

Highest median household income

Jefferson County

$95,490

Which is the largest county in Montana? The answer depends on whether you mean area or population.

The counties, by shape

Every one, drawn to its own scale so the small ones stay recognisable. Shape alone is not a size comparison; the table below carries the areas.

What the map does not say

The counties of Montana are nowhere near the same size. Beaverhead County covers 5,543 sq mi of land, 7.7 times the 718 sq mi of Silver Bow County. People are spread even less evenly: Yellowstone County packs 65.6 per sq mi while Garfield County holds 0.25 per sq mi.

They were not drawn in one sitting either. Missoula County dates to 1864, and the boundaries were still being redrawn when Petroleum County was organised in 1926, 62 years later. Founding years come from Wikidata and are worth checking against the county's own history before citing.

Water is part of the picture too: 9.9% of Lake County is water, the most in the state, which is why its land area and total area disagree. And 25 of the 56 counties here share their names with counties in other states, so searching by name alone can land in the wrong place; the A to Z index lists every duplicate.

All 56 counties of Montana

Sortable on any column. This table doubles as the text alternative to the map above: every area is a link, in alphabetical order, whether or not the map renders.

The 56 counties of Montana, with population, land area, density, median household income, county seat and FIPS code.
NamePopulationLand areaDensityMedian incomeSeatFIPS
Beaverhead County10,0435,543 sq mi1.8 per sq mi$61,268Dillon30001
Big Horn County12,7524,998 sq mi2.6 per sq mi$58,750Hardin30003
Blaine County6,8604,228 sq mi1.6 per sq mi$64,813Chinook30005
Broadwater County8,4931,192 sq mi7.1 per sq mi$70,374Townsend30007
Carbon County11,4662,048 sq mi5.6 per sq mi$80,261Red Lodge30009
Carter County1,3833,340 sq mi0.41 per sq mi$54,167Ekalaka30011
Cascade County85,0292,698 sq mi31.5 per sq mi$67,690Great Falls30013
Chouteau County5,8653,973 sq mi1.5 per sq mi$58,218Fort Benton30015
Custer County12,0343,783 sq mi3.2 per sq mi$70,605Miles City30017
Daniels County1,6121,426 sq mi1.1 per sq mi$55,625Scobey30019
Dawson County8,6922,372 sq mi3.7 per sq mi$71,334Glendive30021
Deer Lodge County9,709736.7 sq mi13.2 per sq mi$57,527Anaconda30023
Fallon County2,9591,621 sq mi1.8 per sq mi$76,250Baker30025
Fergus County11,8254,339 sq mi2.7 per sq mi$63,706Lewistown30027
Flathead County115,4295,087 sq mi22.7 per sq mi$73,925Kalispell30029
Gallatin County128,7402,605 sq mi49.4 per sq mi$93,528Bozeman30031
Garfield County1,1484,677 sq mi0.25 per sq mi$69,583Jordan30033
Glacier County13,4632,995 sq mi4.5 per sq mi$46,875Cut Bank30035
Golden Valley County8441,174 sq mi0.72 per sq mi$58,333Ryegate30037
Granite County3,6581,727 sq mi2.1 per sq mi$59,265Philipsburg30039
Hill County16,1672,899 sq mi5.6 per sq mi$52,798Havre30041
Jefferson County13,3291,657 sq mi8.0 per sq mi$95,490Boulder30043
Judith Basin County2,1621,870 sq mi1.2 per sq mi$59,000Stanford30045
Lake County33,3921,491 sq mi22.4 per sq mi$63,360Polson30047
Lewis and Clark County75,3313,458 sq mi21.8 per sq mi$78,237Helena30049
Liberty County1,9571,430 sq mi1.4 per sq mi$57,857Chester30051
Lincoln County22,3283,613 sq mi6.2 per sq mi$47,143Libby30053
Madison County10,0263,588 sq mi2.8 per sq mi$75,250Virginia City30057
McCone County1,7202,642 sq mi0.65 per sq mi$69,375Circle30055
Meagher County2,1372,392 sq mi0.89 per sq mi$71,932White Sulphur Springs30059
Mineral County5,1851,220 sq mi4.3 per sq mi$63,450Superior30061
Missoula County123,5132,593 sq mi47.6 per sq mi$75,598Missoula30063
Musselshell County5,5821,869 sq mi3.0 per sq mi$58,920Roundup30065
Park County18,2142,802 sq mi6.5 per sq mi$70,047Livingston30067
Petroleum County5481,656 sq mi0.33 per sq mi$60,208Winnett30069
Phillips County4,2035,140 sq mi0.82 per sq mi$53,417Malta30071
Pondera County6,0721,625 sq mi3.7 per sq mi$52,338Conrad30073
Powder River County1,7813,298 sq mi0.54 per sq mi$67,045Broadus30075
Powell County7,1572,326 sq mi3.1 per sq mi$66,923Deer Lodge30077
Prairie County1,1121,737 sq mi0.64 per sq mi$51,250Terry30079
Ravalli County48,5822,391 sq mi20.3 per sq mi$71,283Hamilton30081
Richland County11,3772,085 sq mi5.5 per sq mi$73,084Sidney30083
Roosevelt County10,2422,355 sq mi4.4 per sq mi$57,063Wolf Point30085
Rosebud County8,2535,008 sq mi1.7 per sq mi$49,914Forsyth30087
Sanders County14,0622,760 sq mi5.1 per sq mi$57,476Thompson Falls30089
Sheridan County3,4361,677 sq mi2.1 per sq mi$70,147Plentywood30091
Silver Bow County36,118718 sq mi50.3 per sq mi$61,754Butte30093
Stillwater County9,4451,797 sq mi5.3 per sq mi$84,732Columbus30095
Sweet Grass County3,7621,856 sq mi2.0 per sq mi$77,000Big Timber30097
Teton County6,4962,272 sq mi2.9 per sq mi$70,430Choteau30099
Toole County5,2111,915 sq mi2.7 per sq mi$57,731Shelby30101
Treasure County728977.8 sq mi0.75 per sq mi$67,917Hysham30103
Valley County7,3854,926 sq mi1.5 per sq mi$71,695Glasgow30105
Wheatland County2,1001,422 sq mi1.5 per sq mi$49,489Harlowton30107
Wibaux County885889.6 sq mi1.00 per sq mi$67,462Wibaux30109
Yellowstone County172,6922,633 sq mi65.6 per sq mi$76,570Billings30111

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

The ten most populous

  1. Yellowstone County172,692
  2. Gallatin County128,740
  3. Missoula County123,513
  4. Flathead County115,429
  5. Cascade County85,029
  6. Lewis and Clark County75,331
  7. Ravalli County48,582
  8. Silver Bow County36,118
  9. Lake County33,392
  10. Lincoln County22,328

Data on this page last rebuilt 30 August 2026. How these figures are produced.