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 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 160,390
2 Missoula County 119,062
3 Gallatin County 111,401
4 Flathead County 102,001
5 Cascade County 81,576
6 Lewis and Clark County 68,714
7 Ravalli County 43,424
8 Silver Bow County 34,895
9 Lake County 30,383
10 Lincoln County 19,845
11 Park County 16,513
12 Hill County 16,422
13 Glacier County 13,706
14 Big Horn County 13,302
15 Jefferson County 12,069
16 Sanders County 11,804
17 Custer County 11,563
18 Fergus County 11,167
19 Richland County 11,097
20 Roosevelt County 11,091
21 Carbon County 10,689
22 Stillwater County 9,562
23 Beaverhead County 9,454
24 Deer Lodge County 9,153
25 Rosebud County 9,065
26 Dawson County 8,824
27 Madison County 8,530
28 Valley County 7,424
29 Powell County 6,843
30 Blaine County 6,698
31 Teton County 6,127
32 Broadwater County 6,080
33 Pondera County 5,911
34 Chouteau County 5,731
35 Toole County 4,812
36 Musselshell County 4,682
37 Mineral County 4,330
38 Phillips County 4,032
39 Sweet Grass County 3,676
40 Sheridan County 3,389
41 Granite County 3,325
42 Fallon County 2,975
43 Liberty County 2,455
44 Wheatland County 2,138
45 Judith Basin County 1,968
46 McCone County 1,826
47 Meagher County 1,795
48 Daniels County 1,705
49 Powder River County 1,634
50 Carter County 1,305
51 Prairie County 1,162
52 Garfield County 1,051
53 Wibaux County 1,037
54 Golden Valley County 814
55 Treasure County 614
56 Petroleum County 464

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/.

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