Montana Counties by Population (2024)

Population

20K

40K

60K

80K

100K

120K

140K

160K

Hover/click a county for data.

56 counties

County
2024 Pop.
Change (2020)
Area (mi²)
Density (/mi²)
Location
Yellowstone County171,8163.99%1K65Yellowstone County location
Gallatin County127,8806.93%1K49Gallatin County location
Missoula County122,6873.67%1K47Missoula County location
Flathead County115,47310.1%2K23Flathead County location
Cascade County84,7990.46%1K31Cascade County location
Lewis and Clark County76,2387.11%1.3K22Lewis and Clark County location
Ravalli County48,2998.75%92320Ravalli County location
Silver Bow County36,7734.44%27751Silver Bow County location
Lake County33,8238.21%57523Lake County location
Lincoln County22,28012.9%1.4K6Lincoln County location
Park County18,0534.82%1.1K6Park County location
Hill County16,4341%1.1K6Hill County location
Sanders County13,98412.25%1.1K5Sanders County location
Glacier County13,568-1.29%1.2K5Glacier County location
Jefferson County13,2659.25%6408Jefferson County location
Big Horn County12,676-3.09%1.9K3Big Horn County location
Custer County11,9700.88%1.5K3Custer County location
Fergus County11,8723.46%1.7K3Fergus County location
Carbon County11,60210.44%7916Carbon County location
Richland County11,116-3.62%8055Richland County location
Roosevelt County10,101-6.48%9094Roosevelt County location
Beaverhead County10,0236.83%2.1K2Beaverhead County location
Deer Lodge County9,8024.06%28413Deer Lodge County location
Madison County9,79013.04%1.4K3Madison County location
Stillwater County9,1771.93%6945Stillwater County location
Dawson County8,813-1.24%9164Dawson County location
Broadwater County8,29320.89%4607Broadwater County location
Rosebud County8,168-1.7%1.9K2Rosebud County location
Valley County7,406-1.99%1.9K2Valley County location
Powell County7,1883.54%8983Powell County location
Blaine County6,826-2.58%1.6K2Blaine County location
Teton County6,5144.19%8773Teton County location
Pondera County6,1584.76%6274Pondera County location
Chouteau County5,786-1.92%1.5K1Chouteau County location
Musselshell County5,44714.67%7213Musselshell County location
Toole County5,1894.36%7393Toole County location
Mineral County5,16012.96%4714Mineral County location
Phillips County4,2701.35%2K1Phillips County location
Sweet Grass County3,7993.51%7162Sweet Grass County location
Granite County3,69311.5%6672Granite County location
Sheridan County3,441-2.8%6472Sheridan County location
Fallon County2,938-3%6262Fallon County location
Meagher County2,11610.21%9231Meagher County location
Judith Basin County2,1074.31%7221Judith Basin County location
Wheatland County2,0760%5491Wheatland County location
Liberty County1,9741.02%5521Liberty County location
Powder River County1,7543.42%1.3K1Powder River County location
McCone County1,641-5.03%1K1McCone County location
Daniels County1,621-2%5501Daniels County location
Carter County1,4332.07%1.3K0.43Carter County location
Garfield County1,2042.73%1.8K0.26Garfield County location
Prairie County1,1162.29%6701Prairie County location
Wibaux County893-4.49%3441Wibaux County location
Golden Valley County8442.8%4531Golden Valley County location
Treasure County7904.08%3781Treasure County location
Petroleum County58717.64%6390.35Petroleum County location
  1. Montana Census & Economic Information Center
  2. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  3. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  4. American Community Survey (2009 - 2013)
  5. Census QuickFacts
  6. Historical Populations of States and Counties (1790 - 1990)

Sources