Ranking of Montana Counties By Population in 2018

Updated on January 28, 2024.

Based on the US Census Vintage data estimates, in 2018, the Population for Montana was 1.06M. Among all Montana counties, Yellowstone County had the highest population (160.12K), followed by Missoula County (118.96K), and Gallatin County (111.88K).

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 2018
Yellowstone
Missoula
Gallatin
Flathead
Cascade
Lewis and Clark
Ravalli
Silver Bow
Lake
Lincoln
Ranking of Montana Counties By Population in 2018
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Rank County Population
1 Yellowstone County 160118
2 Missoula County 118959
3 Gallatin County 111878
4 Flathead County 102100
5 Cascade County 81756
6 Lewis and Clark County 68775
7 Ravalli County 43377
8 Silver Bow County 34768
9 Lake County 30346
10 Lincoln County 19862
11 Park County 16662
12 Hill County 16351
13 Glacier County 13797
14 Big Horn County 13305
15 Jefferson County 12084
16 Sanders County 11744
17 Custer County 11576
18 Fergus County 11088
19 Roosevelt County 11084
20 Richland County 10955
21 Carbon County 10654
22 Stillwater County 9496
23 Beaverhead County 9413
24 Deer Lodge County 9159
25 Rosebud County 9047
26 Dawson County 8683
27 Madison County 8586
28 Valley County 7409
29 Powell County 6920
30 Blaine County 6764
31 Teton County 6121
32 Broadwater County 6043
33 Pondera County 5936
34 Chouteau County 5759
35 Toole County 4830
36 Musselshell County 4623
37 Mineral County 4314
38 Phillips County 4047
39 Sweet Grass County 3701
40 Sheridan County 3379
41 Granite County 3355
42 Fallon County 2925
43 Liberty County 2440
44 Wheatland County 2163
45 Judith Basin County 1950
46 Meagher County 1847
47 Powder River County 1729
48 Daniels County 1706
49 McCone County 1655
50 Garfield County 1262
51 Carter County 1223
52 Prairie County 1056
53 Wibaux County 1029
54 Golden Valley County 825
55 Treasure County 667
56 Petroleum County 517