Largest Counties in Montana

Rank County Population County Seat Established Area (km2) Density
1 Yellowstone County 155,623 Billings 1893 6,825 22.8
2 Missoula County 112,673 Missoula 1864 6,729 16.74
3 Gallatin County 97,297 Bozeman 1864 6,493 14.98
4 Flathead County 94,913 Kalispell 1893 13,206 7.19
5 Cascade County 82,333 Great Falls 1887 6,988 11.78
6 Lewis and Clark County 65,845 Helena 1864 8,964 7.35
7 Ravalli County 41,019 Hamilton 1893 6,200 6.62
8 Silver Bow County 34,669 Butte 1881 1,860 18.64
9 Lake County 29,088 Polson 1923 3,869 7.52
10 Lincoln County 19,114 Libby 1909 9,358 2.04
11 Hill County 16,585 Havre 1912 7,501 2.21
12 Park County 15,869 Livingston 1887 6,879 2.31
13 Glacier County 13,685 Cut Bank 1919 7,757 1.76
14 Big Horn County 13,271 Hardin 1913 12,937 1.03
15 Custer County 12,081 Miles City 1865 9,798 1.23
16 Richland County 11,565 Sidney 1914 5,398 2.14
17 Jefferson County 11,547 Boulder 1864 4,292 2.69
18 Fergus County 11,431 Lewistown 1885 11,238 1.02
19 Sanders County 11,353 Thompson Falls 1905 7,154 1.59
20 Roosevelt County 11,321 Wolf Point 1919 6,102 1.86
21 Carbon County 10,388 Red Lodge 1895 5,304 1.96
22 Dawson County 9,507 Glendive 1865 6,146 1.55
23 Beaverhead County 9,334 Dillon 1864 14,356 0.65
24 Rosebud County 9,315 Forsyth 1901 12,981 0.72
25 Stillwater County 9,279 Columbus 1913 4,649 2
26 Deer Lodge County 9,139 Anaconda 1864 1,909 4.79
27 Madison County 7,809 Virginia City 1864 9,290 0.84
28 Valley County 7,629 Glasgow 1893 12,745 0.6
29 Powell County 6,898 Deer Lodge 1901 6,024 1.15
30 Blaine County 6,608 Chinook 1895 10,945 0.6
31 Pondera County 6,208 Conrad 1919 4,209 1.47
32 Teton County 6,053 Choteau 1893 5,887 1.03
33 Chouteau County 5,883 Fort Benton 1865 10,290 0.57
34 Broadwater County 5,656 Townsend 1897 3,087 1.83
35 Toole County 5,139 Shelby 1914 4,949 1.04
36 Musselshell County 4,578 Roundup 1911 4,836 0.95
37 Mineral County 4,246 Superior 1914 3,160 1.34
38 Phillips County 4,181 Malta 1915 13,313 0.31
39 Sheridan County 3,685 Plentywood 1913 4,343 0.85
40 Sweet Grass County 3,654 Big Timber 1895 4,804 0.76
41 Granite County 3,198 Philipsburg 1893 4,475 0.71
42 Fallon County 3,097 Baker 1913 4,196 0.74
43 Liberty County 2,348 Chester 1920 3,704 0.63
44 Wheatland County 2,091 Harlowton 1917 3,686 0.57
45 Judith Basin County 1,980 Stanford 1920 4,843 0.41
46 Meagher County 1,842 White Sulphur Springs 1867 6,195 0.3
47 Daniels County 1,782 Scobey 1920 3,693 0.48
48 Powder River County 1,772 Broadus 1919 8,539 0.21
49 McCone County 1,683 Circle 1919 6,845 0.25
50 Garfield County 1,298 Jordan 1919 12,090 0.11
51 Carter County 1,158 Ekalaka 1917 8,651 0.13
52 Prairie County 1,137 Terry 1915 4,499 0.25
53 Wibaux County 1,110 Wibaux 1914 2,302 0.48
54 Golden Valley County 841 Ryegate 1920 3,043 0.28
55 Treasure County 681 Hysham 1919 2,536 0.27
56 Petroleum County 474 Winnett 1926 4,284 0.11
57 Perry County 18,960 Perryville 1821 1,230 15.41
58 New Madrid County 18,945 New Madrid 1812 1,756 10.79
59 Wright County 18,804 Hartville 1841 1,766 10.65
60 Pike County 18,505 Bowling Green 1818 1,743 10.62
61 Pemiscot County 18,285 Caruthersville 1851 1,277 14.32
62 Ste. Genevieve County 18,134 Ste. Genevieve 1812 1,300 13.95
63 Cooper County 17,590 Boonville 1818 1,463 12.02
64 Andrew County 17,280 Savannah 1841 1,127 15.33
65 Bates County 17,038 Butler 1841 2,196 7.76
66 Dallas County 16,766 Buffalo 1841 1,404 11.94
67 Dent County 15,646 Salem 1851 1,953 8.01
68 Moniteau County 15,596 California 1845 1,080 14.44
69 Macon County 15,555 Macon 1837 2,082 7.47
70 Gasconade County 15,211 Hermann 1821 1,347 11.29
71 Livingston County 15,184 Chillicothe 1837 1,386 10.96
72 Mississippi County 14,347 Charleston 1842 1,070 13.41
73 Ripley County 14,089 Doniphan 1831 1,632 8.63
74 Cedar County 13,971 Stockton 1845 1,233 11.33
75 Osage County 13,867 Linn 1841 1,570 8.83
76 Douglas County 13,673 Ava 1857 2,111 6.48
77 Wayne County 13,510 Greenville 1818 1,971 6.85
78 DeKalb County 12,881 Maysville 1843 1,098 11.73
79 Linn County 12,750 Linneus 1837 1,606 7.94
80 Barton County 12,391 Lamar 1855 1,538 8.06
81 Bollinger County 12,352 Marble Hill 1851 1,608 7.68
82 Montgomery County 12,225 Montgomery City 1818 1,396 8.76
83 Madison County 12,215 Fredericktown 1818 1,287 9.49
84 Oregon County 10,870 Alton 1841 2,051 5.3
85 Iron County 10,619 Ironton 1857 1,427 7.44
86 Grundy County 10,250 Trenton 1839 1,129 9.08
87 Lewis County 10,200 Monticello 1833 1,308 7.8
88 Ralls County 10,156 New London 1821 1,220 8.32
89 Howard County 10,133 Fayette 1816 1,207 8.4
90 Saint Clair County 9,794 Osceola 1841 1,753 5.59
91 Ozark County 9,712 Gainesville 1841 1,935 5.02
92 Hickory County 9,616 Hermitage 1845 1,033 9.31
93 Caldwell County 9,413 Kingston 1836 1,111 8.47
94 Carroll County 9,284 Carrollton 1833 1,800 5.16
95 Maries County 9,165 Vienna 1855 1,368 6.7
96 Harrison County 8,946 Bethany 1843 1,878 4.76
97 Monroe County 8,829 Paris 1831 1,673 5.28
98 Shannon County 8,430 Eminence 1837 2,600 3.24
99 Daviess County 8,422 Gallatin 1836 1,469 5.73
100 Dade County 7,872 Greenfield 1841 1,269 6.2
101 Chariton County 7,820 Keytesville 1821 1,958 3.99
102 Clark County 7,128 Kahoka 1836 1,313 5.43
103 Gentry County 6,727 Albany 1841 1,274 5.28
104 Sullivan County 6,703 Milan 1843 1,686 3.98
105 Reynolds County 6,685 Centerville 1845 2,100 3.18
106 Shelby County 6,362 Shelbyville 1835 1,298 4.9
107 Carter County 6,254 Van Buren 1859 1,316 4.75
108 Atchison County 5,674 Rock Port 1843 1,412 4.02
109 Putnam County 4,968 Unionville 1843 1,342 3.7
110 Holt County 4,901 Oregon 1841 1,197 4.09
111 Scotland County 4,832 Memphis 1841 1,134 4.26
112 Schuyler County 4,420 Lancaster 1843 798 5.54
113 Knox County 4,120 Edina 1843 1,311 3.14
114 Mercer County 3,774 Princeton 1845 1,176 3.21
115 Worth County 2,160 Grant City 1861 689 3.13

Largest Counties in Montana

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