Missouri Population By County in 2021

Updated on August 1, 2024.

Based on the US Census Vintage data estimates, in 2021, the population of Missouri was 6,170,393. Among all Missouri counties, St. Louis had the highest population (998,439), followed by Jackson (717,875), and St. Charles (410,465). Worth was the least populated county (1,967).

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 2021
Missouri Population By County in 2021
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County Population % of State Population
Adair 25188 0.41
Andrew 18015 0.29
Atchison 5210 0.08
Audrain 24861 0.40
Barry 34762 0.56
Barton 11665 0.19
Bates 16095 0.26
Benton 19934 0.32
Bollinger 10586 0.17
Boone 186115 3.02
Buchanan 83623 1.36
Butler 42170 0.68
Caldwell 8904 0.14
Callaway 44640 0.72
Camden 43507 0.71
Cape Girardeau 82132 1.33
Carroll 8398 0.14
Carter 5321 0.09
Cass 109780 1.78
Cedar 14515 0.24
Chariton 7361 0.12
Christian 91616 1.49
Clark 6735 0.11
Clay 255871 4.15
Clinton 21213 0.34
Cole 76603 1.24
Cooper 16676 0.27
Crawford 22820 0.37
Dade 7596 0.12
Dallas 17336 0.28
Daviess 8400 0.14
DeKalb 11690 0.19
Dent 14454 0.23
Douglas 11749 0.19
Dunklin 27743 0.45
Franklin 105307 1.71
Gasconade 14780 0.24
Gentry 6184 0.10
Greene 301098 4.88
Grundy 9757 0.16
Harrison 8184 0.13
Henry 22208 0.36
Hickory 8572 0.14
Holt 4232 0.07
Howard 10145 0.16
Howell 40016 0.65
Iron 9429 0.15
Jackson 717875 11.63
Jasper 123324 2.00
Jefferson 227993 3.70
Johnson 54194 0.88
Knox 3785 0.06
Laclede 36156 0.59
Lafayette 32834 0.53
Lawrence 38268 0.62
Lewis 9994 0.16
Lincoln 61640 1.00
Linn 11842 0.19
Livingston 14191 0.23
McDonald 23429 0.38
Macon 15178 0.25
Madison 12664 0.21
Maries 8417 0.14
Marion 28556 0.46
Mercer 3481 0.06
Miller 24941 0.40
Mississippi 12105 0.20
Moniteau 15310 0.25
Monroe 8701 0.14
Montgomery 11433 0.19
Morgan 21430 0.35
New Madrid 16035 0.26
Newton 59440 0.96
Nodaway 20983 0.34
Oregon 8625 0.14
Osage 13398 0.22
Ozark 8785 0.14
Pemiscot 15241 0.25
Perry 18972 0.31
Pettis 43213 0.70
Phelps 44899 0.73
Pike 17596 0.28
Platte 108744 1.76
Polk 32042 0.52
Pulaski 53815 0.87
Putnam 4695 0.08
Ralls 10368 0.17
Randolph 24563 0.40
Ray 23089 0.37
Reynolds 6084 0.10
Ripley 10645 0.17
St. Charles 410465 6.65
St. Clair 9413 0.15
Ste. Genevieve 18569 0.30
St. Francois 67010 1.09
St. Louis 998439 16.18
Saline 23253 0.38
Schuyler 4015 0.07
Scotland 4674 0.08
Scott 37886 0.61
Shannon 7090 0.12
Shelby 5965 0.10
Stoddard 28519 0.46
Stone 31592 0.51
Sullivan 5898 0.10
Taney 56304 0.91
Texas 24868 0.40
Vernon 19588 0.32
Warren 36551 0.59
Washington 23392 0.38
Wayne 10922 0.18
Webster 39601 0.64
Worth 1967 0.03
Wright 18621 0.30
St. Louis city 293622 4.76