Ranking of Montana Counties By Population in 2015

Updated on January 28, 2024.

Based on the US Census Vintage data estimates, in 2015, the Population for Montana was 1.03M. Among all Montana counties, Yellowstone County had the highest population (156.66K), followed by Missoula County (114.28K), and Gallatin County (101.04K).

The chart below shows the top 10 counties, and the table below shows the ranking of all Montana counties.

You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.

See this for other years:
Ranking of Montana Counties By Population in 2015
Yellowstone
Missoula
Gallatin
Flathead
Cascade
Lewis and Clark
Ravalli
Silver Bow
Lake
Lincoln
Ranking of Montana Counties By Population in 2015
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Rank County Population
1 Yellowstone County 156658
2 Missoula County 114281
3 Gallatin County 101043
4 Flathead County 95940
5 Cascade County 81959
6 Lewis and Clark County 66308
7 Ravalli County 41199
8 Silver Bow County 34746
9 Lake County 29482
10 Lincoln County 19085
11 Hill County 16435
12 Park County 16013
13 Glacier County 13647
14 Big Horn County 13310
15 Custer County 12098
16 Richland County 11931
17 Jefferson County 11576
18 Roosevelt County 11416
19 Fergus County 11315
20 Sanders County 11298
21 Carbon County 10404
22 Dawson County 9591
23 Stillwater County 9419
24 Rosebud County 9355
25 Beaverhead County 9303
26 Deer Lodge County 9115
27 Madison County 8033
28 Valley County 7630
29 Powell County 6793
30 Blaine County 6683
31 Pondera County 6100
32 Teton County 6064
33 Chouteau County 5777
34 Broadwater County 5717
35 Toole County 5083
36 Musselshell County 4631
37 Mineral County 4194
38 Phillips County 4150
39 Sheridan County 3673
40 Sweet Grass County 3618
41 Fallon County 3172
42 Granite County 3160
43 Liberty County 2395
44 Wheatland County 2110
45 Judith Basin County 1932
46 Meagher County 1822
47 Powder River County 1768
48 Daniels County 1751
49 McCone County 1698
50 Garfield County 1283
51 Carter County 1147
52 Prairie County 1140
53 Wibaux County 1071
54 Golden Valley County 818
55 Treasure County 680
56 Petroleum County 475