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Montana county map

See all 56 counties on one clear, labelled map. Use the alphabetical table below to verify names and compare land area.

Boundary vintage: 2025Source: U.S. Census BureauUpdated September 15, 2026
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Labelled map of Montana counties BeaverheadBig HornBlaineBroadwaterCarbonCarterCascadeChouteauCusterDanielsDawsonDeer LodgeFallonFergusFlatheadGallatinGarfieldGlacierGolden ValleyGraniteHillJeffersonJudith BasinLakeLewis and ClarkLibertyLincolnMadisonMcConeMeagherMineralMissoulaMusselshellParkPetroleumPhillipsPonderaPowder RiverPowellPrairieRavalliRichlandRooseveltRosebudSandersSheridanSilver BowStillwaterSweet GrassTetonTooleTreasureValleyWheatlandWibauxYellowstone
Boundary data: U.S. Census Bureau 2025 cartographic boundary files. Zoom in for county names, then drag the map or use the arrow keys to move around.
Map scope: This is a county boundary reference map. It does not show roads, parcels, ZIP codes, election precincts, or terrain.

Alphabetical list of Montana counties

The land-area figures are rounded to the nearest square mile. Water area is shown separately so large lakes or coastal waters do not obscure the comparison.

NameFIPS codeLand areaWater area
Beaverhead County300015,543 sq mi30 sq mi
Big Horn County300034,998 sq mi18 sq mi
Blaine County300054,228 sq mi11 sq mi
Broadwater County300071,192 sq mi46 sq mi
Carbon County300092,048 sq mi14 sq mi
Carter County300113,340 sq mi8 sq mi
Cascade County300132,698 sq mi13 sq mi
Chouteau County300153,973 sq mi24 sq mi
Custer County300173,783 sq mi10 sq mi
Daniels County300191,426 sq mi0 sq mi
Dawson County300212,372 sq mi12 sq mi
Deer Lodge County30023737 sq mi5 sq mi
Fallon County300251,621 sq mi2 sq mi
Fergus County300274,339 sq mi11 sq mi
Flathead County300295,087 sq mi169 sq mi
Gallatin County300312,605 sq mi28 sq mi
Garfield County300334,677 sq mi173 sq mi
Glacier County300352,995 sq mi41 sq mi
Golden Valley County300371,174 sq mi1 sq mi
Granite County300391,727 sq mi6 sq mi
Hill County300412,899 sq mi17 sq mi
Jefferson County300431,657 sq mi2 sq mi
Judith Basin County300451,870 sq mi1 sq mi
Lake County300471,491 sq mi163 sq mi
Lewis and Clark County300493,458 sq mi39 sq mi
Liberty County300511,430 sq mi17 sq mi
Lincoln County300533,613 sq mi62 sq mi
Madison County300573,588 sq mi15 sq mi
McCone County300552,642 sq mi40 sq mi
Meagher County300592,392 sq mi3 sq mi
Mineral County300611,220 sq mi4 sq mi
Missoula County300632,593 sq mi25 sq mi
Musselshell County300651,869 sq mi3 sq mi
Park County300672,802 sq mi11 sq mi
Petroleum County300691,656 sq mi19 sq mi
Phillips County300715,140 sq mi72 sq mi
Pondera County300731,625 sq mi17 sq mi
Powder River County300753,298 sq mi1 sq mi
Powell County300772,326 sq mi6 sq mi
Prairie County300791,737 sq mi6 sq mi
Ravalli County300812,391 sq mi9 sq mi
Richland County300832,085 sq mi19 sq mi
Roosevelt County300852,355 sq mi15 sq mi
Rosebud County300875,008 sq mi17 sq mi
Sanders County300892,760 sq mi29 sq mi
Sheridan County300911,677 sq mi29 sq mi
Silver Bow County30093718 sq mi1 sq mi
Stillwater County300951,797 sq mi9 sq mi
Sweet Grass County300971,856 sq mi7 sq mi
Teton County300992,272 sq mi20 sq mi
Toole County301011,915 sq mi30 sq mi
Treasure County30103978 sq mi7 sq mi
Valley County301054,926 sq mi136 sq mi
Wheatland County301071,422 sq mi5 sq mi
Wibaux County30109890 sq mi1 sq mi
Yellowstone County301112,633 sq mi16 sq mi

Largest Montana counties by land area

These are the five largest mapped units in Montana by Census-reported land area:

  1. Beaverhead County — 5,543 square miles
  2. Phillips County — 5,140 square miles
  3. Flathead County — 5,087 square miles
  4. Rosebud County — 5,008 square miles
  5. Big Horn County — 4,998 square miles

How to read and use this map

County lines are administrative boundaries, not postal routes. A mailing address can use a city name associated with a neighboring area, and ZIP codes can cross county lines. When you need to identify a county for an address, confirm it with an official geocoder or local government source.

For classroom or planning use, print directly from this page. If labels become crowded, choose landscape orientation and reduce page margins. The underlying vector lines remain crisp at different sizes.

Frequently asked questions

How many counties are in Montana?

Montana has 56 counties in the U.S. Census Bureau’s 2025 cartographic boundary file.

Can I print this Montana county map?

Yes. Choose Print map and use landscape orientation for the widest map. Because the map is SVG, its boundary lines stay sharp when scaled.

Are these legal survey boundaries?

No. This is a generalized reference map. Property, parcel, election, and legal boundary questions should be checked with the relevant state or local agency.

Map source

U.S. Census Bureau, 2025 Cartographic Boundary File, Counties, 1:20,000,000. Land and water area fields are supplied in the same file and converted from square meters to square miles. Accessed September 15, 2026.