Missouri Population By County in 2021 (ACS-5Yrs)

Updated on July 2, 2024.

Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Missouri was 6.14M. Among all Missouri counties, St. Louis was the most populated county (1.00M), followed by Jackson (713.23K), and then St. Charles (402.38K).

On the other hand, the least populated counties were: Worth (2.00K), Mercer (3.56K), and Knox (3.78K).

The chart and table below shows the population of each county and the percentage of Missouri population in each county.

You can see similar information for other states and by state for the United States.

Missouri Population By County in 2021
Missouri Population By County in 2021
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County Population % of State Population
Adair 25339 0.41
Andrew 18023 0.29
Atchison 5312 0.09
Audrain 25223 0.41
Barry 34648 0.56
Barton 11712 0.19
Bates 16100 0.26
Benton 19351 0.32
Bollinger 10758 0.18
Boone 182170 2.97
Buchanan 85545 1.39
Butler 42314 0.69
Caldwell 8856 0.14
Callaway 44449 0.72
Camden 43053 0.70
Cape Girardeau 81086 1.32
Carroll 8564 0.14
Carter 5365 0.09
Cass 106966 1.74
Cedar 14184 0.23
Chariton 7432 0.12
Christian 87824 1.43
Clark 6649 0.11
Clay 250134 4.07
Clinton 21095 0.34
Cole 77412 1.26
Cooper 17397 0.28
Crawford 23204 0.38
Dade 7584 0.12
Dallas 16946 0.28
Daviess 8427 0.14
DeKalb 11639 0.19
Dent 14585 0.24
Douglas 11808 0.19
Dunklin 28592 0.47
Franklin 104331 1.70
Gasconade 14803 0.24
Gentry 6231 0.10
Greene 296875 4.83
Grundy 9901 0.16
Harrison 8229 0.13
Henry 21884 0.36
Hickory 8429 0.14
Holt 4295 0.07
Howard 10147 0.17
Howell 39753 0.65
Iron 9606 0.16
Jackson 713229 11.61
Jasper 122059 1.99
Jefferson 225913 3.68
Johnson 53889 0.88
Knox 3782 0.06
Laclede 35898 0.59
Lafayette 32752 0.53
Lawrence 38123 0.62
Lewis 10031 0.16
Lincoln 58689 0.96
Linn 11962 0.20
Livingston 15001 0.24
McDonald 23267 0.38
Macon 15222 0.25
Madison 12597 0.21
Maries 8457 0.14
Marion 28564 0.47
Mercer 3561 0.06
Miller 24643 0.40
Mississippi 12976 0.21
Moniteau 15723 0.26
Monroe 8643 0.14
Montgomery 11384 0.19
Morgan 20883 0.34
New Madrid 16658 0.27
Newton 58634 0.96
Nodaway 21571 0.35
Oregon 8891 0.14
Osage 13372 0.22
Ozark 8664 0.14
Pemiscot 15949 0.26
Perry 19007 0.31
Pettis 42919 0.70
Phelps 44692 0.73
Pike 18052 0.29
Platte 105189 1.71
Polk 31541 0.51
Pulaski 53460 0.87
Putnam 4715 0.08
Ralls 10318 0.17
Randolph 24880 0.41
Ray 23080 0.38
Reynolds 6138 0.10
Ripley 11032 0.18
St. Charles 402377 6.55
St. Clair 9235 0.15
Ste. Genevieve 18406 0.30
St. Francois 67168 1.09
St. Louis 1001982 16.32
Saline 23278 0.38
Schuyler 4094 0.07
Scotland 4760 0.08
Scott 38161 0.62
Shannon 7185 0.12
Shelby 6087 0.10
Stoddard 28812 0.47
Stone 31018 0.51
Sullivan 6045 0.10
Taney 55854 0.91
Texas 24866 0.41
Vernon 19831 0.32
Warren 35033 0.57
Washington 23791 0.39
Wayne 11298 0.18
Webster 38978 0.64
Worth 2004 0.03
Wright 18244 0.30
St. Louis city 302787 4.93