Montana Counties by Population

Below are the 56 Montana counties sorted by population from largest to smallest. The population data are from the 2021 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!

Rank County Population
1 Yellowstone County 163,593
2 Missoula County 117,379
3 Gallatin County 116,725
4 Flathead County 103,400
5 Cascade County 84,178
6 Lewis and Clark County 70,340
7 Ravalli County 43,790
8 Silver Bow County 35,017
9 Lake County 31,030
10 Lincoln County 19,674
11 Park County 17,072
12 Hill County 16,297
13 Glacier County 13,827
14 Big Horn County 13,198
15 Sanders County 12,298
16 Jefferson County 12,057
17 Custer County 11,968
18 Fergus County 11,464
19 Richland County 11,375
20 Roosevelt County 10,884
21 Carbon County 10,488
22 Beaverhead County 9,391
23 Deer Lodge County 9,380
24 Dawson County 9,003
25 Stillwater County 8,916
26 Madison County 8,499
27 Rosebud County 8,464
28 Valley County 7,553
29 Blaine County 7,051
30 Powell County 6,955
31 Broadwater County 6,641
32 Teton County 6,173
33 Pondera County 5,974
34 Chouteau County 5,896
35 Toole County 5,013
36 Musselshell County 4,813
37 Mineral County 4,490
38 Phillips County 4,233
39 Sweet Grass County 3,690
40 Sheridan County 3,522
41 Granite County 3,333
42 Fallon County 3,074
43 Wheatland County 2,082
44 Liberty County 2,026
45 Judith Basin County 2,004
46 Meagher County 1,932
47 McCone County 1,805
48 Powder River County 1,759
49 Daniels County 1,739
50 Carter County 1,349
51 Prairie County 1,227
52 Wibaux County 1,018
53 Garfield County 972
54 Golden Valley County 820
55 Treasure County 693
56 Petroleum County 434

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/.

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