Montana Counties by Population (2024)

by Kristen Carney Kristen Carney

Updated: June 20, 2024

The most populated counties in Montana are Yellowstone County with 170,843, Gallatin County at 126,409, Missoula County with 121,849, Flathead County at 113,679, and Cascade County with 84,900. You can get the most current Census population data for all 56 Montana counties, sorted from the most populous counties in Montana to the least, according to the 2023 Population Estimates Program.

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Rank County Population
1 Yellowstone County 170,843
2 Gallatin County 126,409
3 Missoula County 121,849
4 Flathead County 113,679
5 Cascade County 84,900
6 Lewis and Clark County 75,011
7 Ravalli County 47,738
8 Silver Bow County 36,360
9 Lake County 33,338
10 Lincoln County 21,895
11 Park County 17,903
12 Hill County 16,276
13 Sanders County 13,684
14 Glacier County 13,609
15 Jefferson County 13,048
16 Big Horn County 12,751
17 Custer County 11,985
18 Fergus County 11,772
19 Carbon County 11,419
20 Richland County 11,173
21 Roosevelt County 10,319
22 Beaverhead County 9,885
23 Deer Lodge County 9,673
24 Madison County 9,521
25 Stillwater County 9,173
26 Dawson County 8,810
27 Rosebud County 8,160
28 Broadwater County 8,032
29 Valley County 7,474
30 Powell County 7,133
31 Blaine County 6,899
32 Teton County 6,430
33 Pondera County 6,125
34 Chouteau County 5,847
35 Musselshell County 5,308
36 Toole County 5,133
37 Mineral County 5,090
38 Phillips County 4,249
39 Sweet Grass County 3,763
40 Granite County 3,595
41 Sheridan County 3,498
42 Fallon County 2,994
43 Judith Basin County 2,093
44 Meagher County 2,071
45 Wheatland County 2,057
46 Liberty County 1,974
47 Powder River County 1,743
48 McCone County 1,676
49 Daniels County 1,633
50 Carter County 1,418
51 Garfield County 1,211
52 Prairie County 1,112
53 Wibaux County 910
54 Golden Valley County 835
55 Treasure County 772
56 Petroleum County 554

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2023. U.S. Census Bureau, Population Division. Web. May 2024. http://www.census.gov/.

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