Population of Counties in Montana (2018)

Name 2018 Population Growth Rate
Yellowstone County157,6486.26%
Missoula County115,8965.91%
Gallatin County104,07216.15%
Flathead County97,6937.53%
Cascade County81,488-0.00%
Lewis and Clark County66,7925.08%
Ravalli County41,8763.88%
Silver Bow County34,4670.74%
Lake County29,7113.21%
Lincoln County19,230-2.37%
Hill County16,4461.86%
Park County16,0983.21%
Glacier County13,6691.89%
Big Horn County13,3713.55%
Custer County11,8211.10%
Jefferson County11,7703.19%
Sanders County11,4660.63%
Richland County11,40816.90%
Fergus County11,300-2.42%
Roosevelt County11,2197.43%
Carbon County10,4984.33%
Beaverhead County9,4442.06%
Stillwater County9,3672.54%
Rosebud County9,2650.15%
Dawson County9,2433.29%
Deer Lodge County9,069-2.37%
Madison County7,9693.53%
Valley County7,5372.17%
Powell County6,848-2.34%
Blaine County6,6572.37%
Pondera County6,028-2.11%
Teton County6,012-0.99%
Chouteau County5,794-0.24%
Broadwater County5,7882.68%
Toole County4,961-7.15%
Musselshell County4,6361.78%
Mineral County4,125-2.32%
Phillips County4,116-3.24%
Sweet Grass County3,6280.28%
Sheridan County3,5966.77%
Granite County3,2926.88%
Fallon County3,0916.99%
Liberty County2,4283.45%
Wheatland County2,111-2.09%
Judith Basin County1,949-5.94%
Meagher County1,842-1.92%
Powder River County1,7520.75%
McCone County1,739-0.34%
Daniels County1,734-0.86%
Garfield County1,3089.73%
Carter County1,1771.47%
Prairie County1,166-1.44%
Wibaux County1,0473.87%
Golden Valley County815-7.28%
Treasure County685-4.60%
Petroleum County4980.61%