Ranking of Missouri Counties By Population in 2018

Updated on June 18, 2025.

Based on the US Census Vintage data estimates, in 2018, the Population for Missouri was 6.13M. Among all Missouri counties, St. Louis County had the highest population (995.90K), followed by Jackson County (701.81K), and St. Charles County (398.66K).

The chart below shows the top 10 counties, and the table below shows the ranking of all Missouri 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 Missouri Counties By Population in 2018
St. Louis
Jackson
St. Charles
St. Louis city
Greene
Clay
Jefferson
Boone
Jasper
Cass
Ranking of Missouri Counties By Population in 2018
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Rank County Population
1 St. Louis County 995900
2 Jackson County 701809
3 St. Charles County 398656
4 St. Louis city 303661
5 Greene County 291430
6 Clay County 246798
7 Jefferson County 224656
8 Boone County 179569
9 Jasper County 120349
10 Cass County 104753
11 Franklin County 103716
12 Platte County 102953
13 Buchanan County 88047
14 Christian County 87248
15 Cape Girardeau County 78810
16 Cole County 76734
17 St. Francois County 66740
18 Newton County 58233
19 Lincoln County 57604
20 Taney County 55817
21 Johnson County 53718
22 Pulaski County 51982
23 Camden County 45956
24 Callaway County 44987
25 Phelps County 44549
26 Butler County 42641
27 Pettis County 42449
28 Howell County 40103
29 Webster County 39205
30 Scott County 38596
31 Lawrence County 38271
32 Barry County 35687
33 Laclede County 35684
34 Warren County 34801
35 Lafayette County 32567
36 Polk County 32244
37 Stone County 31729
38 Dunklin County 29464
39 Stoddard County 29288
40 Marion County 28564
41 Adair County 25593
42 Texas County 25560
43 Audrain County 25411
44 Miller County 25269
45 Washington County 24900
46 Randolph County 24697
47 Crawford County 23948
48 McDonald County 23031
49 Ray County 22924
50 Saline County 22907
51 Nodaway County 22244
52 Henry County 21885
53 Vernon County 20544
54 Morgan County 20466
55 Clinton County 20435
56 Benton County 19377
57 Perry County 19284
58 Pike County 18495
59 Wright County 18230
60 Ste. Genevieve County 17890
61 Andrew County 17661
62 Cooper County 17604
63 New Madrid County 17234
64 Dallas County 16828
65 Bates County 16320
66 Pemiscot County 16281
67 Moniteau County 16118
68 Dent County 15592
69 Livingston County 15169
70 Macon County 15167
71 Gasconade County 14680
72 Cedar County 14126
73 Osage County 13640
74 Ripley County 13428
75 Douglas County 13416
76 Mississippi County 13369
77 Wayne County 13079
78 DeKalb County 12534
79 Madison County 12205
80 Bollinger County 12167
81 Linn County 12002
82 Barton County 11756
83 Montgomery County 11458
84 Oregon County 10557
85 Ralls County 10233
86 Iron County 10193
87 Howard County 10027
88 Grundy County 9949
89 Lewis County 9844
90 St. Clair County 9431
91 Hickory County 9416
92 Caldwell County 9073
93 Ozark County 9011
94 Maries County 8795
95 Carroll County 8724
96 Monroe County 8630
97 Harrison County 8362
98 Daviess County 8330
99 Shannon County 8192
100 Dade County 7560
101 Chariton County 7449
102 Clark County 6827
103 Gentry County 6579
104 Reynolds County 6267
105 Sullivan County 6189
106 Carter County 6068
107 Shelby County 6004
108 Atchison County 5161
109 Scotland County 4937
110 Putnam County 4748
111 Schuyler County 4577
112 Holt County 4382
113 Knox County 3943
114 Mercer County 3625
115 Worth County 2011