Montana Counties by Land Area
Want to know about the largest to smallest counties in Montana, USA in terms of total land area? Check this resource Montana counties by land area to discover all the details regarding county map (boundary), and nearby counties. On the other hand, check Montana counties by population to know more about county based demographic details.
What is the largest county in Montana by land area?
Beaverhead County is the largest county in Montana spanning 5542.69 square miles, with an additional 30.25 square miles of water area. Following Beaverhead County, Phillips County ranks as the second largest in terms of land area, covering 5140.42 square miles, while Flathead County secures the position as the third largest county in Montana.
What is the smallest county by land area in Montana?
Silver Bow County is the smallest in Montana by total land area, covers about 717.99 square miles.
What is the largest county by population in Montana?
Yellowstone County in Montana, USA, stands as the most populous county having 164,731 residents as per the 2022 census data.
What is the smallest county by population in Montana?
Petroleum County is the smallest in Montana by total population, having 496 residents as per the 2022 census data.
| Rank | County in Montana | Land Area square miles | Water Area square miles | Total Area square miles |
|---|---|---|---|---|
| 1 | Beaverhead County | 5,543 | 30 | 5,573 |
| 2 | Phillips County | 5,140 | 72 | 5,212 |
| 3 | Flathead County | 5,087 | 169 | 5,256 |
| 4 | Rosebud County | 5,008 | 17 | 5,025 |
| 5 | Big Horn County | 4,998 | 18 | 5,016 |
| 6 | Valley County | 4,926 | 136 | 5,062 |
| 7 | Garfield County | 4,677 | 173 | 4,849 |
| 8 | Fergus County | 4,339 | 11 | 4,350 |
| 9 | Blaine County | 4,228 | 11 | 4,239 |
| 10 | Chouteau County | 3,973 | 24 | 3,997 |
| 11 | Custer County | 3,783 | 10 | 3,793 |
| 12 | Lincoln County | 3,613 | 62 | 3,675 |
| 13 | Madison County | 3,588 | 15 | 3,604 |
| 14 | Lewis and Clark County | 3,458 | 39 | 3,498 |
| 15 | Carter County | 3,340 | 8 | 3,348 |
| 16 | Powder River County | 3,298 | 1 | 3,299 |
| 17 | Glacier County | 2,995 | 41 | 3,036 |
| 18 | Hill County | 2,899 | 17 | 2,916 |
| 19 | Park County | 2,802 | 11 | 2,813 |
| 20 | Sanders County | 2,760 | 29 | 2,790 |
| 21 | Cascade County | 2,698 | 13 | 2,711 |
| 22 | McCone County | 2,642 | 40 | 2,682 |
| 23 | Yellowstone County | 2,633 | 16 | 2,649 |
| 24 | Gallatin County | 2,605 | 28 | 2,634 |
| 25 | Missoula County | 2,593 | 25 | 2,618 |
| 26 | Meagher County | 2,392 | 3 | 2,395 |
| 27 | Ravalli County | 2,391 | 9 | 2,400 |
| 28 | Dawson County | 2,372 | 12 | 2,383 |
| 29 | Roosevelt County | 2,355 | 15 | 2,370 |
| 30 | Powell County | 2,326 | 6 | 2,332 |
| 31 | Teton County | 2,272 | 20 | 2,292 |
| 32 | Richland County | 2,085 | 19 | 2,103 |
| 33 | Carbon County | 2,048 | 14 | 2,061 |
| 34 | Toole County | 1,915 | 30 | 1,945 |
| 35 | Judith Basin County | 1,870 | 1 | 1,870 |
| 36 | Musselshell County | 1,869 | 3 | 1,872 |
| 37 | Sweet Grass County | 1,856 | 7 | 1,862 |
| 38 | Stillwater County | 1,797 | 9 | 1,806 |
| 39 | Prairie County | 1,737 | 6 | 1,742 |
| 40 | Granite County | 1,727 | 6 | 1,733 |
| 41 | Sheridan County | 1,677 | 29 | 1,706 |
| 42 | Jefferson County | 1,657 | 2 | 1,659 |
| 43 | Petroleum County | 1,656 | 19 | 1,675 |
| 44 | Pondera County | 1,625 | 17 | 1,642 |
| 45 | Fallon County | 1,621 | 2 | 1,623 |
| 46 | Lake County | 1,490 | 164 | 1,654 |
| 47 | Liberty County | 1,430 | 17 | 1,447 |
| 48 | Daniels County | 1,426 | 0 | 1,427 |
| 49 | Wheatland County | 1,422 | 5 | 1,428 |
| 50 | Mineral County | 1,220 | 4 | 1,223 |
| 51 | Broadwater County | 1,192 | 46 | 1,238 |
| 52 | Golden Valley County | 1,174 | 1 | 1,175 |
| 53 | Treasure County | 978 | 7 | 984 |
| 54 | Wibaux County | 890 | 1 | 890 |
| 55 | Deer Lodge County | 737 | 5 | 741 |
| 56 | Silver Bow County | 718 | 1 | 719 |