Largest Counties in Missouri

Rank County Population County Seat Established Area (km2) Density
1 Saint Louis County 1,000,427 Clayton 1812 1,316 760.2
2 Jackson County 674,147 Independence 1826 1,567 430.22
3 Saint Charles County 360,474 Saint Charles 1812 1,453 248.09
4 Saint Louis City 319,283 Saint Louis 1876 160 1,995.52
5 Greene County 275,163 Springfield 1833 1,748 157.42
6 Clay County 221,928 Liberty 1822 1,026 216.3
7 Jefferson County 218,722 Hillsboro 1818 1,702 128.51
8 Boone County 162,631 Columbia 1821 1,774 91.67
9 Jasper County 117,393 Carthage 1841 1,658 70.8
10 Franklin County 101,481 Union 1818 2,388 42.5
11 Cass County 99,467 Harrisonville 1833 1,810 54.95
12 Platte County 89,311 Platte City 1838 1,088 82.09
13 Buchanan County 89,190 Saint Joseph 1838 1,062 83.98
14 Christian County 77,411 Ozark 1859 1,458 53.09
15 Cole County 75,979 Jefferson City 1820 1,015 74.86
16 Cape Girardeau County 75,663 Jackson 1812 1,500 50.44
17 Saint Francois County 65,348 Farmington 1821 1,165 56.09
18 Newton County 58,103 Neosho 1838 1,621 35.84
19 Johnson County 52,584 Warrensburg 1834 2,152 24.43
20 Lincoln County 52,555 Troy 1818 1,632 32.2
21 Pulaski County 52,263 Waynesville 1833 1,417 36.88
22 Taney County 51,664 Forsyth 1837 1,637 31.56
23 Phelps County 45,145 Rolla 1857 1,743 25.9
24 Callaway County 44,321 Fulton 1821 2,173 20.4
25 Camden County 43,991 Camdenton 1841 1,696 25.94
26 Butler County 42,783 Poplar Bluff 1849 1,808 23.66
27 Pettis County 42,190 Sedalia 1833 1,774 23.78
28 Howell County 40,389 West Plains 1857 2,404 16.8
29 Scott County 39,180 Benton 1822 1,090 35.94
30 Lawrence County 38,623 Mount Vernon 1843 1,588 24.32
31 Webster County 36,191 Marshfield 1855 1,536 23.56
32 Barry County 35,586 Cassville 1835 2,018 17.63
33 Laclede County 35,560 Lebanon 1849 1,984 17.92
34 Lafayette County 33,370 Lexington 1821 1,629 20.48
35 Warren County 32,502 Warrenton 1833 1,119 29.05
36 Stone County 32,191 Galena 1851 1,199 26.85
37 Dunklin County 31,942 Kennett 1843 1,414 22.59
38 Polk County 31,126 Bolivar 1835 1,650 18.86
39 Stoddard County 29,957 Bloomfield 1835 2,142 13.99
40 Marion County 28,770 Palmyra 1826 1,134 25.37
41 Texas County 25,997 Houston 1843 3,054 8.51
42 Adair County 25,596 Kirksville 1841 1,471 17.4
43 Audrain County 25,518 Mexico 1831 1,795 14.22
44 Randolph County 25,403 Huntsville 1829 1,248 20.35
45 Washington County 25,184 Potosi 1813 1,968 12.8
46 Miller County 24,737 Tuscumbia 1837 1,533 16.14
47 Crawford County 24,685 Steelville 1829 1,924 12.83
48 Ray County 23,483 Richmond 1820 1,476 15.91
49 Nodaway County 23,359 Maryville 1843 2,271 10.29
50 Saline County 23,359 Marshall 1820 1,958 11.93
51 McDonald County 23,072 Pineville 1847 1,399 16.49
52 Henry County 22,261 Clinton 1834 1,818 12.24
53 Vernon County 21,148 Nevada 1851 2,160 9.79
54 Clinton County 20,732 Plattsburg 1833 1,085 19.11
55 Morgan County 20,554 Versailles 1833 1,549 13.27
56 Benton County 19,045 Warsaw 1835 1,829 10.41
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 Sainte 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 Missouri

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