Clicky

The Counties in Montana By Population

The 56 counties in Montana combine to a total population for the state of 1,080,577 (2020 census). There are just 4 counties with a population of over 100,000, these include Yellowstone, Missoula, Gallatin, and Flathead. On the opposite end of the spectrum, we have Wibaux, Golden Valley, Treasure, and Petroleum with fewer than 1,000 people in the entire county!

The data below comes from the 2020 census conducted by the U.S. Census Bureau and is updated frequently to reflect the most recent data possible.

Click here to view the population of cities in Montana.

County Change Population Total Change (2010) % Change (2010)
Yellowstone Positive 162,990 1,641 1.00%
Missoula Positive 121,630 1,564 1.30%
Gallatin Positive 116,806 2,334 2.00%
Flathead Positive 105,851 1,971 1.90%
Cascade Negative 81,346 -47 -0.10%
Lewis and Clark Positive 70,229 651 0.90%
Ravalli Positive 45,002 853 1.90%
Silver Bow Positive 35,180 279 0.80%
Lake Positive 30,986 400 1.30%
Lincoln Positive 20,343 244 1.20%
Park Positive 16,760 148 0.90%
Hill Negative 16,358 -136 -0.80%
Glacier Negative 13,594 -107 -0.80%
Big Horn Negative 13,063 -185 -1.40%
Jefferson Positive 12,360 149 1.20%
Sanders Positive 12,157 211 1.80%
Custer Negative 11,292 -69 -0.60%
Fergus Positive 11,104 72 0.70%
Richland Positive 11,043 100 0.90%
Roosevelt Negative 10,964 -63 -0.60%
Carbon Positive 10,921 218 2.00%
Stillwater Positive 9,888 217 2.20%
Beaverhead Positive 9,483 9 0.10%
Deer Lodge Negative 9,204 -3 0.00%
Madison Positive 8,959 210 2.40%
Rosebud Negative 8,836 -119 -1.30%
Dawson Negative 8,555 -83 -1.00%
Valley Negative 7,359 -31 -0.40%
Powell Negative 6,817 -37 -0.50%
Blaine Negative 6,568 -136 -2.00%
Broadwater Positive 6,444 241 3.90%
Teton Positive 6,249 99 1.60%
Pondera Negative 5,782 -76 -1.30%
Chouteau Positive 5,699 18 0.30%
Toole Negative 4,686 -23 -0.50%
Musselshell Positive 4,669 43 0.90%
Mineral Positive 4,544 122 2.80%
Phillips Negative 3,919 -36 -0.90%
Sweet Grass Negative 3,684 -33 -0.90%
Granite Negative 3,317 -18 -0.50%
Sheridan Negative 3,261 -57 -1.70%
Fallon Negative 2,826 -52 -1.80%
Liberty Negative 2,369 -17 -0.70%
Wheatland Positive 2,157 55 2.60%
Judith Basin Negative 1,994 -16 -0.80%
Meagher Negative 1,831 -10 -0.50%
Powder River Negative 1,681 -7 -0.40%
McCone Negative 1,648 -1 -0.10%
Daniels Negative 1,638 -8 -0.50%
Garfield Negative 1,268 -4 -0.30%
Carter Negative 1,235 -10 -0.80%
Prairie Positive 1,067 3 0.30%
Wibaux Negative 939 -15 -1.60%
Golden Valley Zero 827 0 0.00%
Treasure Negative 695 -2 -0.30%
Petroleum Positive 500 3 0.60%