Fastest growing counties in Montana.
County | Rank | Change (2020) | 2024 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Broadwater County | 1 | 20.89% | 8,293 | 6,860 |
| Petroleum County | 2 | 17.64% | 587 | 499 |
| Musselshell County | 3 | 14.67% | 5,447 | 4,750 |
| Madison County | 4 | 13.04% | 9,790 | 8,661 |
| Mineral County | 5 | 12.96% | 5,160 | 4,568 |
| Lincoln County | 6 | 12.9% | 22,280 | 19,734 |
| Sanders County | 7 | 12.25% | 13,984 | 12,458 |
| Granite County | 8 | 11.5% | 3,693 | 3,312 |
| Carbon County | 9 | 10.44% | 11,602 | 10,505 |
| Meagher County | 10 | 10.21% | 2,116 | 1,920 |
| Flathead County | 11 | 10.1% | 115,473 | 104,876 |
| Jefferson County | 12 | 9.25% | 13,265 | 12,142 |
| Ravalli County | 13 | 8.75% | 48,299 | 44,411 |
| Lake County | 14 | 8.21% | 33,823 | 31,258 |
| Lewis and Clark County | 15 | 7.11% | 76,238 | 71,177 |
| Gallatin County | 16 | 6.93% | 127,880 | 119,597 |
| Beaverhead County | 17 | 6.83% | 10,023 | 9,382 |
| Park County | 18 | 4.82% | 18,053 | 17,223 |
| Pondera County | 19 | 4.76% | 6,158 | 5,878 |
| Silver Bow County | 20 | 4.44% | 36,773 | 35,210 |
| Toole County | 21 | 4.36% | 5,189 | 4,972 |
| Judith Basin County | 22 | 4.31% | 2,107 | 2,020 |
| Teton County | 23 | 4.19% | 6,514 | 6,252 |
| Treasure County | 24 | 4.08% | 790 | 759 |
| Deer Lodge County | 25 | 4.06% | 9,802 | 9,420 |
| Yellowstone County | 26 | 3.99% | 171,816 | 165,218 |
| Missoula County | 27 | 3.67% | 122,687 | 118,347 |
| Powell County | 28 | 3.54% | 7,188 | 6,942 |
| Sweet Grass County | 29 | 3.51% | 3,799 | 3,670 |
| Fergus County | 30 | 3.46% | 11,872 | 11,475 |
| Powder River County | 31 | 3.42% | 1,754 | 1,696 |
| Golden Valley County | 32 | 2.8% | 844 | 821 |
| Garfield County | 33 | 2.73% | 1,204 | 1,172 |
| Prairie County | 34 | 2.29% | 1,116 | 1,091 |
| Carter County | 35 | 2.07% | 1,433 | 1,404 |
| Stillwater County | 36 | 1.93% | 9,177 | 9,003 |
| Phillips County | 37 | 1.35% | 4,270 | 4,213 |
| Liberty County | 38 | 1.02% | 1,974 | 1,954 |
| Hill County | 39 | 1% | 16,434 | 16,271 |
| Custer County | 40 | 0.88% | 11,970 | 11,866 |
| Cascade County | 41 | 0.46% | 84,799 | 84,407 |
| Wheatland County | 42 | 0% | 2,076 | 2,076 |
| Dawson County | 43 | -1.24% | 8,813 | 8,924 |
| Glacier County | 44 | -1.29% | 13,568 | 13,745 |
| Rosebud County | 45 | -1.7% | 8,168 | 8,309 |
| Chouteau County | 46 | -1.92% | 5,786 | 5,899 |
| Valley County | 47 | -1.99% | 7,406 | 7,556 |
| Daniels County | 48 | -2% | 1,621 | 1,654 |
| Blaine County | 49 | -2.58% | 6,826 | 7,007 |
| Sheridan County | 50 | -2.8% | 3,441 | 3,540 |
| Fallon County | 51 | -3% | 2,938 | 3,029 |
| Big Horn County | 52 | -3.09% | 12,676 | 13,080 |
| Richland County | 53 | -3.62% | 11,116 | 11,534 |
| Wibaux County | 54 | -4.49% | 893 | 935 |
| McCone County | 55 | -5.03% | 1,641 | 1,728 |
| Roosevelt County | 56 | -6.48% | 10,101 | 10,801 |