Montana Counties by Population

Below are the 56 Montana counties sorted by population from largest to smallest. The population data are from the 2022 Population Estimates Program and 2021 American Community Survey.

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Rank County Population
1 Yellowstone County 169,852
2 Gallatin County 124,857
3 Missoula County 121,041
4 Flathead County 111,814
5 Cascade County 84,864
6 Lewis and Clark County 73,832
7 Ravalli County 47,298
8 Silver Bow County 36,068
9 Lake County 32,853
10 Lincoln County 21,525
11 Park County 17,790
12 Hill County 16,068
13 Glacier County 13,681
14 Sanders County 13,442
15 Big Horn County 12,851
16 Jefferson County 12,826
17 Custer County 12,032
18 Fergus County 11,663
19 Richland County 11,237
20 Carbon County 11,179
21 Roosevelt County 10,572
22 Beaverhead County 9,719
23 Deer Lodge County 9,510
24 Madison County 9,265
25 Stillwater County 9,177
26 Dawson County 8,830
27 Rosebud County 8,088
28 Broadwater County 7,793
29 Valley County 7,513
30 Powell County 7,051
31 Blaine County 6,936
32 Teton County 6,368
33 Pondera County 6,078
34 Chouteau County 5,898
35 Musselshell County 5,197
36 Toole County 5,082
37 Mineral County 5,058
38 Phillips County 4,240
39 Sweet Grass County 3,715
40 Sheridan County 3,564
41 Granite County 3,502
42 Fallon County 3,011
43 Judith Basin County 2,105
44 Wheatland County 2,032
45 Meagher County 2,013
46 Liberty County 1,972
47 Powder River County 1,725
48 McCone County 1,709
49 Daniels County 1,628
50 Carter County 1,382
51 Garfield County 1,218
52 Prairie County 1,107
53 Wibaux County 919
54 Golden Valley County 835
55 Treasure County 758
56 Petroleum County 524

United States Census Bureau. B01001 SEX BY AGE, 2021 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 8 December 2022. http://www.census.gov/.

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2022. U.S. Census Bureau, Population Division. Web. May 2023. http://www.census.gov/.

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