Missouri Population By County in 2021
Updated on June 16, 2025.
Based on the US Census Vintage data estimates, in 2021, the population of Missouri was 6,171,374. Among all Missouri counties, St. Louis had the highest population (998,785), followed by Jackson (717,993), and St. Charles (410,515). Worth was the least populated county (1,973).
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.
Related Topics: Missouri Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
See this for other years:
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 | 24858 | 0.40 |
| Barry | 34762 | 0.56 |
| Barton | 11670 | 0.19 |
| Bates | 16099 | 0.26 |
| Benton | 19940 | 0.32 |
| Bollinger | 10582 | 0.17 |
| Boone | 186132 | 3.02 |
| Buchanan | 83636 | 1.36 |
| Butler | 42163 | 0.68 |
| Caldwell | 8900 | 0.14 |
| Callaway | 44655 | 0.72 |
| Camden | 43513 | 0.71 |
| Cape Girardeau | 82144 | 1.33 |
| Carroll | 8398 | 0.14 |
| Carter | 5325 | 0.09 |
| Cass | 109792 | 1.78 |
| Cedar | 14519 | 0.24 |
| Chariton | 7367 | 0.12 |
| Christian | 91636 | 1.49 |
| Clark | 6734 | 0.11 |
| Clay | 255908 | 4.15 |
| Clinton | 21222 | 0.34 |
| Cole | 76616 | 1.24 |
| Cooper | 16682 | 0.27 |
| Crawford | 22826 | 0.37 |
| Dade | 7600 | 0.12 |
| Dallas | 17344 | 0.28 |
| Daviess | 8404 | 0.14 |
| DeKalb | 11695 | 0.19 |
| Dent | 14461 | 0.23 |
| Douglas | 11746 | 0.19 |
| Dunklin | 27739 | 0.45 |
| Franklin | 105317 | 1.71 |
| Gasconade | 14782 | 0.24 |
| Gentry | 6189 | 0.10 |
| Greene | 301137 | 4.88 |
| Grundy | 9762 | 0.16 |
| Harrison | 8179 | 0.13 |
| Henry | 22220 | 0.36 |
| Hickory | 8572 | 0.14 |
| Holt | 4234 | 0.07 |
| Howard | 10144 | 0.16 |
| Howell | 40026 | 0.65 |
| Iron | 9431 | 0.15 |
| Jackson | 717993 | 11.63 |
| Jasper | 123324 | 2.00 |
| Jefferson | 228030 | 3.70 |
| Johnson | 54209 | 0.88 |
| Knox | 3786 | 0.06 |
| Laclede | 36163 | 0.59 |
| Lafayette | 32835 | 0.53 |
| Lawrence | 38263 | 0.62 |
| Lewis | 10000 | 0.16 |
| Lincoln | 61651 | 1.00 |
| Linn | 11844 | 0.19 |
| Livingston | 14206 | 0.23 |
| McDonald | 23432 | 0.38 |
| Macon | 15183 | 0.25 |
| Madison | 12665 | 0.21 |
| Maries | 8418 | 0.14 |
| Marion | 28564 | 0.46 |
| Mercer | 3480 | 0.06 |
| Miller | 24949 | 0.40 |
| Mississippi | 12105 | 0.20 |
| Moniteau | 15313 | 0.25 |
| Monroe | 8708 | 0.14 |
| Montgomery | 11440 | 0.19 |
| Morgan | 21441 | 0.35 |
| New Madrid | 16039 | 0.26 |
| Newton | 59451 | 0.96 |
| Nodaway | 20984 | 0.34 |
| Oregon | 8628 | 0.14 |
| Osage | 13397 | 0.22 |
| Ozark | 8790 | 0.14 |
| Pemiscot | 15246 | 0.25 |
| Perry | 18975 | 0.31 |
| Pettis | 43220 | 0.70 |
| Phelps | 44912 | 0.73 |
| Pike | 17606 | 0.28 |
| Platte | 108752 | 1.76 |
| Polk | 32047 | 0.52 |
| Pulaski | 53816 | 0.87 |
| Putnam | 4692 | 0.08 |
| Ralls | 10365 | 0.17 |
| Randolph | 24569 | 0.40 |
| Ray | 23095 | 0.37 |
| Reynolds | 6084 | 0.10 |
| Ripley | 10648 | 0.17 |
| St. Charles | 410515 | 6.65 |
| St. Clair | 9416 | 0.15 |
| Ste. Genevieve | 18576 | 0.30 |
| St. Francois | 67015 | 1.09 |
| St. Louis | 998785 | 16.18 |
| Saline | 23263 | 0.38 |
| Schuyler | 4020 | 0.07 |
| Scotland | 4674 | 0.08 |
| Scott | 37894 | 0.61 |
| Shannon | 7100 | 0.12 |
| Shelby | 5974 | 0.10 |
| Stoddard | 28522 | 0.46 |
| Stone | 31590 | 0.51 |
| Sullivan | 5891 | 0.10 |
| Taney | 56313 | 0.91 |
| Texas | 24864 | 0.40 |
| Vernon | 19598 | 0.32 |
| Warren | 36562 | 0.59 |
| Washington | 23403 | 0.38 |
| Wayne | 10925 | 0.18 |
| Webster | 39600 | 0.64 |
| Worth | 1973 | 0.03 |
| Wright | 18625 | 0.30 |
| St. Louis city | 293484 | 4.76 |