Missouri Population By County in 2020

Updated on August 1, 2024.

Based on the US Census Vintage data estimates, in 2020, the population of Missouri was 6,154,426. Among all Missouri counties, St. Louis had the highest population (1,003,130), followed by Jackson (717,615), and St. Charles (406,417). Worth was the least populated county (1,963).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

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

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Missouri Population By County in 2020
Missouri Population By County in 2020
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County Population % of State Population
Adair 25268 0.41
Andrew 18103 0.29
Atchison 5306 0.09
Audrain 24786 0.40
Barry 34544 0.56
Barton 11623 0.19
Bates 16053 0.26
Benton 19422 0.32
Bollinger 10562 0.17
Boone 184047 2.99
Buchanan 84467 1.37
Butler 42070 0.68
Caldwell 8822 0.14
Callaway 44340 0.72
Camden 42806 0.70
Cape Girardeau 81821 1.33
Carroll 8466 0.14
Carter 5202 0.09
Cass 108161 1.76
Cedar 14212 0.23
Chariton 7386 0.12
Christian 89285 1.45
Clark 6660 0.11
Clay 254137 4.13
Clinton 21209 0.35
Cole 76621 1.25
Cooper 16646 0.27
Crawford 23035 0.37
Dade 7584 0.12
Dallas 17128 0.28
Daviess 8430 0.14
DeKalb 11599 0.19
Dent 14387 0.23
Douglas 11606 0.19
Dunklin 28217 0.46
Franklin 104864 1.70
Gasconade 14763 0.24
Gentry 6132 0.10
Greene 299328 4.86
Grundy 9754 0.16
Harrison 8163 0.13
Henry 21976 0.36
Hickory 8299 0.14
Holt 4189 0.07
Howard 10157 0.17
Howell 39799 0.65
Iron 9511 0.16
Jackson 717615 11.66
Jasper 122907 2.00
Jefferson 226937 3.69
Johnson 54031 0.88
Knox 3739 0.06
Laclede 36043 0.59
Lafayette 33055 0.54
Lawrence 38000 0.62
Lewis 10037 0.16
Lincoln 59854 0.97
Linn 11858 0.19
Livingston 13985 0.23
McDonald 23280 0.38
Macon 15196 0.25
Madison 12626 0.21
Maries 8451 0.14
Marion 28486 0.46
Mercer 3513 0.06
Miller 24775 0.40
Mississippi 12125 0.20
Moniteau 15212 0.25
Monroe 8687 0.14
Montgomery 11281 0.18
Morgan 20995 0.34
New Madrid 16325 0.27
Newton 58692 0.95
Nodaway 20997 0.34
Oregon 8608 0.14
Osage 13259 0.22
Ozark 8517 0.14
Pemiscot 15588 0.25
Perry 18970 0.31
Pettis 43006 0.70
Phelps 44559 0.72
Pike 17400 0.28
Platte 107193 1.74
Polk 31617 0.51
Pulaski 54010 0.88
Putnam 4689 0.08
Ralls 10358 0.17
Randolph 24448 0.40
Ray 23133 0.38
Reynolds 6081 0.10
Ripley 10669 0.17
St. Charles 406417 6.60
St. Clair 9347 0.15
Ste. Genevieve 18476 0.30
St. Francois 66443 1.08
St. Louis 1003130 16.30
Saline 23331 0.38
Schuyler 4006 0.07
Scotland 4707 0.08
Scott 38020 0.62
Shannon 7028 0.11
Shelby 6087 0.10
Stoddard 28651 0.47
Stone 31212 0.51
Sullivan 5985 0.10
Taney 56062 0.91
Texas 24324 0.40
Vernon 19670 0.32
Warren 35732 0.58
Washington 23424 0.38
Wayne 10936 0.18
Webster 39013 0.63
Worth 1963 0.03
Wright 18213 0.30
St. Louis city 300496 4.88