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.
Related Topics: Missouri ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
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 |