Rank County Population (2012)
1 Yellowstone County, Montana 151,882
2 Missoula County, Montana 110,977
3 Gallatin County, Montana 92,614
4 Flathead County, Montana 91,633
5 Cascade County, Montana 81,723
6 Lewis and Clark County, Montana 64,876
7 Ravalli County, Montana 40,617
8 Silver Bow County, Montana 34,403
9 Lake County, Montana 28,986
10 Lincoln County, Montana 19,491
11 Hill County, Montana 16,366
12 Park County, Montana 15,567
13 Glacier County, Montana 13,711
14 Big Horn County, Montana 13,061
15 Custer County, Montana 11,888
16 Fergus County, Montana 11,435
17 Sanders County, Montana 11,408
18 Jefferson County, Montana 11,401
19 Roosevelt County, Montana 10,927
20 Richland County, Montana 10,810
21 Carbon County, Montana 10,127
22 Rosebud County, Montana 9,396
23 Beaverhead County, Montana 9,346
24 Dawson County, Montana 9,249
25 Deer Lodge County, Montana 9,227
26 Stillwater County, Montana 9,195
27 Madison County, Montana 7,733
28 Valley County, Montana 7,505
29 Powell County, Montana 7,096
30 Blaine County, Montana 6,683
31 Pondera County, Montana 6,165
32 Teton County, Montana 6,053
33 Chouteau County, Montana 5,904
34 Broadwater County, Montana 5,756
35 Toole County, Montana 5,220
36 Musselshell County, Montana 4,665
37 Mineral County, Montana 4,167
38 Phillips County, Montana 4,128
39 Sweet Grass County, Montana 3,605
40 Sheridan County, Montana 3,580
41 Granite County, Montana 3,109
42 Fallon County, Montana 3,024
43 Liberty County, Montana 2,392
44 Wheatland County, Montana 2,104
45 Judith Basin County, Montana 2,024
46 Meagher County, Montana 1,924
47 Daniels County, Montana 1,786
48 Powder River County, Montana 1,763
49 McCone County, Montana 1,701
50 Garfield County, Montana 1,261
51 Carter County, Montana 1,177
52 Prairie County, Montana 1,157
53 Wibaux County, Montana 1,057
54 Golden Valley County, Montana 839
55 Treasure County, Montana 736
56 Petroleum County, Montana 511

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