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 Census Redistricting dataset. If 2020 Census data are not available for a geography, then the population data are from the Census’ 2019 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 164,731
2 Gallatin County 118,960
3 Missoula County 117,922
4 Flathead County 104,357
5 Cascade County 84,414
6 Lewis and Clark County 70,973
7 Ravalli County 44,174
8 Silver Bow County 35,133
9 Lake County 31,134
10 Lincoln County 19,677
11 Park County 17,191
12 Hill County 16,309
13 Glacier County 13,778
14 Big Horn County 13,124
15 Sanders County 12,400
16 Jefferson County 12,085
17 Custer County 11,867
18 Richland County 11,491
19 Fergus County 11,446
20 Roosevelt County 10,794
21 Carbon County 10,473
22 Deer Lodge County 9,421
23 Beaverhead County 9,371
24 Stillwater County 8,963
25 Dawson County 8,940
26 Madison County 8,623
27 Rosebud County 8,329
28 Valley County 7,578
29 Blaine County 7,044
30 Powell County 6,946
31 Broadwater County 6,774
32 Teton County 6,226
33 Pondera County 5,898
34 Chouteau County 5,895
35 Toole County 4,971
36 Musselshell County 4,730
37 Mineral County 4,535
38 Phillips County 4,217
39 Sweet Grass County 3,678
40 Sheridan County 3,539
41 Granite County 3,309
42 Fallon County 3,049
43 Wheatland County 2,069
44 Judith Basin County 2,023
45 Liberty County 1,959
46 Meagher County 1,927
47 McCone County 1,729
48 Powder River County 1,694
49 Daniels County 1,661
50 Carter County 1,415
51 Garfield County 1,173
52 Prairie County 1,088
53 Wibaux County 937
54 Golden Valley County 823
55 Treasure County 762
56 Petroleum County 496

United States Census Bureau. B01001 SEX BY AGE, 2019 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 10 December 2020. http://www.census.gov/.

United States Census Bureau. "P2 Hispanic or Latino, and Not Hispanic or Latino by Race." 2020 Census State Redistricting Data (Public Law 94-171) Summary File. U.S. Census Bureau, 2020 Census. Web. 12 August 2021. https://www.census.gov/.

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