Population of Counties in Montana (2017)

Name 2017 Population Growth Rate
Yellowstone County158,4376.76%
Missoula County116,1306.10%
Gallatin County104,50216.59%
Flathead County98,0827.94%
Cascade County81,7550.27%
Lewis and Clark County67,2825.78%
Ravalli County42,0884.34%
Silver Bow County34,5530.95%
Lake County29,7583.41%
Lincoln County19,259-2.16%
Hill County16,5422.45%
Park County16,1143.38%
Glacier County13,6941.96%
Big Horn County13,3433.38%
Custer County11,9241.98%
Jefferson County11,8534.03%
Sanders County11,5341.22%
Richland County11,48217.78%
Fergus County11,413-1.50%
Roosevelt County11,3058.25%
Carbon County10,4603.92%
Stillwater County9,4063.19%
Beaverhead County9,4011.71%
Dawson County9,3274.35%
Rosebud County9,2870.41%
Deer Lodge County9,085-2.30%
Madison County7,9243.11%
Valley County7,5392.25%
Powell County6,858-2.28%
Blaine County6,6011.71%
Pondera County6,084-1.33%
Teton County6,056-0.36%
Chouteau County5,759-1.01%
Broadwater County5,7472.13%
Toole County4,977-6.80%
Musselshell County4,5890.95%
Mineral County4,184-0.81%
Phillips County4,133-2.94%
Sheridan County3,6488.22%
Sweet Grass County3,6230.00%
Granite County3,3689.67%
Fallon County3,1208.07%
Liberty County2,4092.29%
Wheatland County2,117-1.99%
Judith Basin County1,940-6.01%
Meagher County1,827-3.28%
Daniels County1,7550.57%
Powder River County1,7460.87%
McCone County1,700-2.19%
Garfield County1,31010.36%
Carter County1,2034.16%
Prairie County1,182-0.34%
Wibaux County1,0938.86%
Golden Valley County831-5.89%
Treasure County692-3.76%
Petroleum County489-0.81%