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Montana Counties by Population

Population figures from the Census Bureau reflect the total count of residents in each area.

All 56 counties ranked by Population, from highest to lowest. Click the column header to reverse sort order. Data from the U.S. Census Bureau, ACS 5-Year Estimates, 2023.

States Counties Cities Metros ZIPs
# Counties Population ↓
1 Yellowstone County, Montana 167,340
2 Gallatin County, Montana 122,194
3 Missoula County, Montana 119,639
4 Flathead County, Montana 108,445
5 Cascade County, Montana 84,601
6 Lewis and Clark County, Montana 72,580
7 Ravalli County, Montana 45,807
8 Silver Bow County, Montana 35,589
9 Lake County, Montana 32,073
10 Lincoln County, Montana 20,656
11 Park County, Montana 17,484
12 Hill County, Montana 16,260
13 Glacier County, Montana 13,713
14 Big Horn County, Montana 12,963
15 Sanders County, Montana 12,936
16 Jefferson County, Montana 12,501
17 Custer County, Montana 11,938
18 Fergus County, Montana 11,581
19 Richland County, Montana 11,329
20 Carbon County, Montana 10,877
21 Roosevelt County, Montana 10,665
22 Beaverhead County, Montana 9,590
23 Deer Lodge County, Montana 9,512
24 Stillwater County, Montana 9,052
25 Madison County, Montana 8,975
26 Dawson County, Montana 8,874
27 Rosebud County, Montana 8,236
28 Valley County, Montana 7,540
29 Broadwater County, Montana 7,310
30 Powell County, Montana 7,029
31 Blaine County, Montana 6,997
32 Teton County, Montana 6,291
33 Pondera County, Montana 6,012
34 Chouteau County, Montana 5,888
35 Musselshell County, Montana 5,068
36 Toole County, Montana 5,028
37 Mineral County, Montana 4,796
38 Phillips County, Montana 4,224
39 Sweet Grass County, Montana 3,713
40 Sheridan County, Montana 3,677
41 Granite County, Montana 3,419
42 Fallon County, Montana 2,817
43 Judith Basin County, Montana 2,053
44 Wheatland County, Montana 2,049
45 Meagher County, Montana 1,979
46 Liberty County, Montana 1,968
47 McCone County, Montana 1,818
48 Powder River County, Montana 1,762
49 Daniels County, Montana 1,524
50 Carter County, Montana 1,361
51 Prairie County, Montana 1,251
52 Wibaux County, Montana 1,148
53 Garfield County, Montana 938
54 Golden Valley County, Montana 840
55 Treasure County, Montana 761
56 Petroleum County, Montana 401