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West county atlas

Montana county map

Explore all 56 counties. Select a county to see its map, or download a copy for your next project.

2025 Census boundaries56 mapped unitsCapital: Helena
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Boundary map 100%
Labelled map of Montana counties Beaverhead CountyBig Horn CountyBlaine CountyBroadwater CountyCarbon CountyCarter CountyCascade CountyChouteau CountyCuster CountyDaniels CountyDawson CountyDeer Lodge CountyFallon CountyFergus CountyFlathead CountyGallatin CountyGarfield CountyGlacier CountyGolden Valley CountyGranite CountyHill CountyJefferson CountyJudith Basin CountyLake CountyLewis and Clark CountyLiberty CountyLincoln CountyMadison CountyMcCone CountyMeagher CountyMineral CountyMissoula CountyMusselshell CountyPark CountyPetroleum CountyPhillips CountyPondera CountyPowder River CountyPowell CountyPrairie CountyRavalli CountyRichland CountyRoosevelt CountyRosebud CountySanders CountySheridan CountySilver Bow CountyStillwater CountySweet Grass CountyTeton CountyToole CountyTreasure CountyValley CountyWheatland CountyWibaux CountyYellowstone County
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2025 U.S. Census boundaries. Zoom to reveal more names. Drag to pan when zoomed; use arrow keys, + and − with the map focused.

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Choose a format for printing, editing, or sharing. All downloads are free.

SVG

SVG is editable vector artwork. PNG is a high-resolution image. PDF uses landscape Letter pages, with a separate key when needed.

Downloads contain the complete boundary map, independent of zoom. Crowded names use a numbered key. Numbered quiz maps use the county list / answer key (CSV). Boundary data (GeoJSON) · Reuse with source credit.

Roads, terrain & aerial imagery

Explore Montana with a county boundary overlay. Choose a view to load the interactive map.

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Street names, terrain, or aerial photography with the county boundary in view.

Backgrounds load from OpenStreetMap or USGS only when selected. Imagery dates and detail vary by location.

Map scope: Use the boundary map for names and shapes, or the interactive background viewer for roads, terrain, and aerial imagery. County boundaries do not identify parcels or ZIP codes.

Montana county geography overview

Montana has 56 counties, which places it 28th among the 50 state and District of Columbia maps in this atlas when ordered by number of county-level units. Their combined 145,550.6 square miles of land place the state 4th by mapped land area.

The average county-level area is 2,599 square miles, while the median is 2,363 square miles. The median is often the better description of a typical unit because one or two very large areas can pull the average upward. The five largest units together account for about 18% of the state’s mapped land area.

56county-level units
2,363 sq mimedian land area
5,542.7 sq milargest unit
1%share of mapped area that is water

Largest and smallest Montana counties

Beaverhead County is the largest county-level unit by land area at 5,542.7 square miles. It represents about 4% of all mapped land in Montana. At the other end of the range, Silver Bow County has 718 square miles of land.

Largest by land area

  1. Beaverhead County5,542.7 sq mi
  2. Phillips County5,140.4 sq mi
  3. Flathead County5,087.3 sq mi
  4. Rosebud County5,008.1 sq mi
  5. Big Horn County4,997.8 sq mi

Smallest by land area

  1. Silver Bow County718 sq mi
  2. Deer Lodge County736.7 sq mi
  3. Wibaux County889.6 sq mi
  4. Treasure County977.8 sq mi
  5. Golden Valley County1,174.4 sq mi

Rankings use land area rather than total area. This avoids making coastal or lake counties appear larger solely because their boundaries include extensive water.

Alphabetical list of Montana counties

The table is alphabetical, so it works as a name and FIPS-code reference rather than an area ranking. Every identifier begins with the Montana state FIPS prefix 30. Land and water figures are rounded to one decimal place.

56 county-level areas

Download county data / numbered map key (CSV)
No.NameFIPS codeLand areaWater area
1Beaverhead County300015,542.7 sq mi30.2 sq mi
2Big Horn County300034,997.8 sq mi18.3 sq mi
3Blaine County300054,227.5 sq mi11.2 sq mi
4Broadwater County300071,192.4 sq mi45.7 sq mi
5Carbon County300092,047.9 sq mi13.5 sq mi
6Carter County300113,340.5 sq mi7.5 sq mi
7Cascade County300132,698.2 sq mi13.2 sq mi
8Chouteau County300153,972.5 sq mi24.2 sq mi
9Custer County300173,783.3 sq mi9.9 sq mi
10Daniels County300191,426.3 sq mi0.4 sq mi
11Dawson County300212,371.9 sq mi11.5 sq mi
12Deer Lodge County30023736.7 sq mi4.7 sq mi
13Fallon County300251,620.6 sq mi2.3 sq mi
14Fergus County300274,339.3 sq mi10.7 sq mi
15Flathead County300295,087.3 sq mi168.7 sq mi
16Gallatin County300312,605.4 sq mi28.4 sq mi
17Garfield County300334,676.6 sq mi172.5 sq mi
18Glacier County300352,995.2 sq mi40.8 sq mi
19Golden Valley County300371,174.4 sq mi1 sq mi
20Granite County300391,727.2 sq mi5.6 sq mi
21Hill County300412,899.4 sq mi17.1 sq mi
22Jefferson County300431,657 sq mi2.4 sq mi
23Judith Basin County300451,869.7 sq mi0.8 sq mi
24Lake County300471,490.5 sq mi163.5 sq mi
25Lewis and Clark County300493,458.4 sq mi39.2 sq mi
26Liberty County300511,430 sq mi17.1 sq mi
27Lincoln County300533,612.6 sq mi62.4 sq mi
28Madison County300573,588.2 sq mi15.4 sq mi
29McCone County300552,642.2 sq mi39.8 sq mi
30Meagher County300592,391.9 sq mi2.9 sq mi
31Mineral County300611,219.6 sq mi3.8 sq mi
32Missoula County300632,593 sq mi24.9 sq mi
33Musselshell County300651,869 sq mi2.7 sq mi
34Park County300672,802.5 sq mi10.8 sq mi
35Petroleum County300691,655.6 sq mi18.9 sq mi
36Phillips County300715,140.4 sq mi71.6 sq mi
37Pondera County300731,624.6 sq mi17 sq mi
38Powder River County300753,298.2 sq mi0.6 sq mi
39Powell County300772,326 sq mi6.3 sq mi
40Prairie County300791,736.6 sq mi5.8 sq mi
41Ravalli County300812,391 sq mi9.4 sq mi
42Richland County300832,084.6 sq mi18.9 sq mi
43Roosevelt County300852,354.6 sq mi14.9 sq mi
44Rosebud County300875,008.1 sq mi17.1 sq mi
45Sanders County300892,760.4 sq mi29.5 sq mi
46Sheridan County300911,676.9 sq mi29 sq mi
47Silver Bow County30093718 sq mi0.6 sq mi
48Stillwater County300951,796.5 sq mi9.2 sq mi
49Sweet Grass County300971,855.5 sq mi6.7 sq mi
50Teton County300992,271.6 sq mi20.3 sq mi
51Toole County301011,914.9 sq mi30.1 sq mi
52Treasure County30103977.8 sq mi6.6 sq mi
53Valley County301054,926.1 sq mi135.7 sq mi
54Wheatland County301071,422.5 sq mi5 sq mi
55Wibaux County30109889.6 sq mi0.7 sq mi
56Yellowstone County301112,633.4 sq mi15.6 sq mi

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, download a PDF from the controls above. Labelled exports use numbered callouts for crowded areas; numbered quiz maps match the alphabetical county list. SVG files keep the boundary lines sharp at larger paper 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 Download / print and select PDF for a landscape Letter page, PNG for an image, or SVG for editable vector artwork. Because the map is SVG, its boundary lines stay sharp when scaled.

What is the largest county in Montana?

Beaverhead County is the largest by land area in this dataset at 5,542.7 square miles. This is an area ranking, not a population ranking.

What is the smallest county in Montana?

Silver Bow County is the smallest by land area in this dataset at 718 square miles.

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, 1:5,000,000. Land and water area fields are supplied in the same file and converted from square meters to square miles. Accessed September 27, 2026.