Montana / Counties by Population

Montana Counties by Population

Below are the 56 Montana counties sorted by population from 1 to 56 . The population data are from the 2021 Population Estimates Program and 2020 American Community Survey. You can copy and paste this list directly into your favorite spreadsheet program. Don't you just adore lovely numbers listed nicely in columns & rows? We do!

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Rank County Population
1 Yellowstone County 167,146
2 Gallatin County 122,713
3 Missoula County 119,533
4 Flathead County 108,454
5 Cascade County 84,511
6 Lewis and Clark County 72,223
7 Ravalli County 45,959
8 Silver Bow County 35,411
9 Lake County 32,033
10 Lincoln County 20,525
11 Park County 17,473
12 Hill County 16,179
13 Glacier County 13,785
14 Sanders County 12,959
15 Big Horn County 12,957
16 Jefferson County 12,470
17 Custer County 11,916
18 Fergus County 11,617
19 Richland County 11,283
20 Carbon County 10,847
21 Roosevelt County 10,821
22 Beaverhead County 9,524
23 Deer Lodge County 9,491
24 Stillwater County 9,044
25 Madison County 8,917
26 Dawson County 8,904
27 Rosebud County 8,124
28 Valley County 7,537
29 Broadwater County 7,288
30 Powell County 6,999
31 Blaine County 6,980
32 Teton County 6,269
33 Pondera County 5,994
34 Chouteau County 5,916
35 Toole County 5,011
36 Musselshell County 4,896
37 Mineral County 4,860
38 Phillips County 4,192
39 Sweet Grass County 3,723
40 Sheridan County 3,527
41 Granite County 3,344
42 Fallon County 3,017
43 Wheatland County 2,059
44 Judith Basin County 2,044
45 Meagher County 1,964
46 Liberty County 1,946
47 McCone County 1,718
48 Powder River County 1,702
49 Daniels County 1,686
50 Carter County 1,428
51 Garfield County 1,209
52 Prairie County 1,091
53 Wibaux County 934
54 Golden Valley County 831
55 Treasure County 768
56 Petroleum County 519

United States Census Bureau. B01001 SEX BY AGE, 2020 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 17 March 2022. http://www.census.gov/.

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2021. U.S. Census Bureau, Population Division. Web. May 2022. http://www.census.gov/.

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