Montana County Map
Labeled county boundary map and complete directory of all 56 counties in Montana (MT, State FIPS 30). View 5-digit FIPS codes, county seats, land area in square miles, and official county government websites below.
Showing all 56 counties in Montana. Use the search box below to filter by county name, 5-digit FIPS code, or county seat.
Montana County Statistics & Summary
Total Counties
56
Largest by Land Area
Beaverhead County
Smallest by Land Area
Silver Bow County
All 56 Counties in Montana (FIPS, County Seat & Official Website)
| County Name | 5-Digit FIPS | Seat / Administrative Center | Land Area (sq mi) | Coordinates | Official Website |
|---|---|---|---|---|---|
| Beaverhead County | 30001 | Dillon | 5,542.7 | 45.134°, -112.893° | Official Site |
| Big Horn County | 30003 | Hardin | 4,997.8 | 45.408°, -107.518° | Official Site |
| Blaine County | 30005 | Chinook | 4,227.5 | 48.428°, -108.968° | Official Site |
| Broadwater County | 30007 | Townsend | 1,192.4 | 46.333°, -111.495° | Official Site |
| Carbon County | 30009 | Red Lodge | 2,047.9 | 45.224°, -109.028° | Official Site |
| Carter County | 30011 | Ekalaka | 3,340.5 | 45.517°, -104.515° | Official Site |
| Cascade County | 30013 | Great Falls | 2,698.2 | 47.321°, -111.347° | Official Site |
| Chouteau County | 30015 | Fort Benton | 3,972.5 | 47.888°, -110.431° | Official Site |
| Custer County | 30017 | Miles City | 3,783.3 | 46.282°, -105.567° | Official Site |
| Daniels County | 30019 | Scobey | 1,426.3 | 48.794°, -105.542° | Official Site |
| Dawson County | 30021 | Glendive | 2,371.9 | 47.266°, -104.898° | Official Site |
| Deer Lodge County | 30023 | Anaconda | 736.7 | 46.095°, -113.142° | Official Site |
| Fallon County | 30025 | Baker | 1,620.6 | 46.318°, -104.410° | Official Site |
| Fergus County | 30027 | Lewistown | 4,339.3 | 47.222°, -109.232° | Official Site |
| Flathead County | 30029 | Kalispell | 5,087.3 | 48.295°, -114.052° | Official Site |
| Gallatin County | 30031 | Bozeman | 2,605.4 | 45.518°, -111.164° | Official Site |
| Garfield County | 30033 | Jordan | 4,676.6 | 47.267°, -106.996° | Official Site |
| Glacier County | 30035 | Cut Bank | 2,995.2 | 48.706°, -112.990° | Official Site |
| Golden Valley County | 30037 | Ryegate | 1,174.4 | 46.381°, -109.175° | Official Site |
| Granite County | 30039 | Philipsburg | 1,727.2 | 46.396°, -113.427° | Official Site |
| Hill County | 30041 | Havre | 2,899.4 | 48.632°, -110.106° | Official Site |
| Jefferson County | 30043 | Boulder | 1,657 | 46.124°, -112.059° | Official Site |
| Judith Basin County | 30045 | Stanford | 1,869.7 | 47.033°, -110.305° | Official Site |
| Lake County | 30047 | Polson | 1,490.5 | 47.643°, -114.084° | Official Site |
| Lewis and Clark County | 30049 | Helena | 3,458.4 | 47.122°, -112.383° | Official Site |
| Liberty County | 30051 | Chester | 1,430 | 48.545°, -111.037° | Official Site |
| Lincoln County | 30053 | Libby | 3,612.6 | 48.552°, -115.463° | Official Site |
| Madison County | 30057 | Virginia City | 3,588.2 | 45.327°, -111.926° | Official Site |
| McCone County | 30055 | Circle | 2,642.2 | 47.630°, -105.757° | Official Site |
| Meagher County | 30059 | White Sulphur Springs | 2,391.9 | 46.605°, -110.910° | Official Site |
| Mineral County | 30061 | Superior | 1,219.6 | 47.130°, -115.085° | Official Site |
| Missoula County | 30063 | Missoula | 2,593 | 47.028°, -113.894° | Official Site |
| Musselshell County | 30065 | Roundup | 1,869 | 46.505°, -108.440° | Official Site |
| Park County | 30067 | Livingston | 2,802.5 | 45.464°, -110.535° | Official Site |
| Petroleum County | 30069 | Winnett | 1,655.6 | 47.142°, -108.227° | Official Site |
| Phillips County | 30071 | Malta | 5,140.4 | 48.250°, -107.929° | Official Site |
| Pondera County | 30073 | Conrad | 1,624.6 | 48.221°, -112.225° | Official Site |
| Powder River County | 30075 | Broadus | 3,298.2 | 45.409°, -105.555° | Official Site |
| Powell County | 30077 | Deer Lodge | 2,326 | 46.844°, -112.931° | Official Site |
| Prairie County | 30079 | Terry | 1,736.6 | 46.812°, -105.504° | Official Site |
| Ravalli County | 30081 | Hamilton | 2,391 | 46.079°, -114.106° | Official Site |
| Richland County | 30083 | Sidney | 2,084.6 | 47.785°, -104.561° | Official Site |
| Roosevelt County | 30085 | Wolf Point | 2,354.6 | 48.283°, -104.995° | Official Site |
| Rosebud County | 30087 | Forsyth | 5,008.1 | 46.173°, -106.667° | Official Site |
| Sanders County | 30089 | Thompson Falls | 2,760.4 | 47.757°, -115.180° | Official Site |
| Sheridan County | 30091 | Plentywood | 1,676.9 | 48.706°, -104.534° | Official Site |
| Silver Bow County | 30093 | Butte | 718 | 45.896°, -112.660° | Official Site |
| Stillwater County | 30095 | Columbus | 1,796.5 | 45.659°, -109.382° | Official Site |
| Sweet Grass County | 30097 | Big Timber | 1,855.5 | 45.801°, -109.953° | Official Site |
| Teton County | 30099 | Choteau | 2,271.6 | 47.819°, -112.282° | Official Site |
| Toole County | 30101 | Shelby | 1,914.9 | 48.645°, -111.733° | Official Site |
| Treasure County | 30103 | Hysham | 977.8 | 46.227°, -107.275° | Official Site |
| Valley County | 30105 | Glasgow | 4,926.1 | 48.350°, -106.670° | Official Site |
| Wheatland County | 30107 | Harlowton | 1,422.5 | 46.497°, -109.858° | Official Site |
| Wibaux County | 30109 | Wibaux | 889.6 | 46.963°, -104.275° | Official Site |
| Yellowstone County | 30111 | Billings | 2,633.4 | 45.937°, -108.277° | Official Site |
How Montana Counties and 5-Digit FIPS Codes Work
In U.S. Census Bureau TIGER/Line geography, Montana (MT) is assigned the 2-digit state Federal Information Processing Series (FIPS) code 30 and covers 145,550 square miles of land area across 56 counties in the Mountain Time (MT) zone (with Helena as the state capital). Every county in the directory above carries a unique 5-digit GEOID formed by combining state prefix 30 with a 3-digit county code (ranging alphabetically from Beaverhead County at 30001 to Yellowstone County at 30111).
Because U.S. Postal Service 5-digit ZIP Codes follow mail carrier delivery routes rather than local government borders, many postal addresses in Montana carry a neighboring city’s mailing name or sit inside a multi-county ZIP Code Tabulation Area (ZCTA). Property tax assessments, deed recording, circuit and county court venue, voter registration precincts, sheriff jurisdiction, and county sales tax rates in Montana are determined by the legal county boundary shown on the map above rather than the postal city name on an envelope.
Land area figures in square miles and internal centroid coordinates (INTPTLAT, INTPTLON) come directly from the U.S. Census Bureau’s current TIGERweb State_County benchmark, while 56 administrative seats and 56 verified official government websites are cross-referenced from Wikidata (CC0). Need a clean outline worksheet without county labels, or want to verify which Montana county a specific home or business address sits in? Open the Blank Map of Montana, run a street-segment check on Address to County Lookup, check multi-county postal overlap on ZIP Code to County Lookup, or browse all 50 states on the National U.S. County Map.
Adjacent State County Maps
Explore county maps and FIPS directories for states bordering Montana: