Ranking of Missouri Counties By Total Voting-age Population (18yrs and over) from Census 2020
Updated on August 22, 2023.
According to the data from the US 2020 Census, as at April 2020, among all the counties in Missouri, St. Louis County had the highest voting-age population (18 years and over) (784.38K), followed by Jackson County (554.17K), and St. Charles County (310.62K).
The chart below shows the top 10 counties with high voting-age population, and the table below shows the ranking of all Missouri counties based on voting-age population.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: Missouri Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Missouri Counties By Total Voting-age Population from Census 2020
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| Rank | County | Voting-age Population |
|---|---|---|
| 1 | St. Louis County | 784377 |
| 2 | Jackson County | 554167 |
| 3 | St. Charles County | 310617 |
| 4 | St. Louis city | 247547 |
| 5 | Greene County | 237444 |
| 6 | Clay County | 191373 |
| 7 | Jefferson County | 174350 |
| 8 | Boone County | 145252 |
| 9 | Jasper County | 92315 |
| 10 | Cass County | 81653 |
| 11 | Platte County | 81192 |
| 12 | Franklin County | 81077 |
| 13 | Buchanan County | 66126 |
| 14 | Christian County | 65681 |
| 15 | Cape Girardeau County | 64296 |
| 16 | Cole County | 60163 |
| 17 | St. Francois County | 52905 |
| 18 | Newton County | 44742 |
| 19 | Taney County | 44701 |
| 20 | Lincoln County | 44385 |
| 21 | Johnson County | 41848 |
| 22 | Pulaski County | 41753 |
| 23 | Phelps County | 35493 |
| 24 | Camden County | 34946 |
| 25 | Callaway County | 34738 |
| 26 | Butler County | 32298 |
| 27 | Pettis County | 32204 |
| 28 | Howell County | 30281 |
| 29 | Scott County | 28941 |
| 30 | Webster County | 28500 |
| 31 | Lawrence County | 28412 |
| 32 | Laclede County | 27397 |
| 33 | Warren County | 27258 |
| 34 | Barry County | 26586 |
| 35 | Stone County | 25786 |
| 36 | Lafayette County | 25400 |
| 37 | Polk County | 23908 |
| 38 | Stoddard County | 22234 |
| 39 | Marion County | 21924 |
| 40 | Dunklin County | 21317 |
| 41 | Adair County | 20460 |
| 42 | Randolph County | 19421 |
| 43 | Texas County | 19140 |
| 44 | Audrain County | 19070 |
| 45 | Miller County | 18884 |
| 46 | Washington County | 18294 |
| 47 | Saline County | 18120 |
| 48 | Crawford County | 17846 |
| 49 | Ray County | 17828 |
| 50 | McDonald County | 17174 |
| 51 | Henry County | 17087 |
| 52 | Nodaway County | 17004 |
| 53 | Clinton County | 16230 |
| 54 | Morgan County | 16220 |
| 55 | Benton County | 15916 |
| 56 | Vernon County | 14930 |
| 57 | Perry County | 14576 |
| 58 | Ste. Genevieve County | 14513 |
| 59 | Andrew County | 13703 |
| 60 | Pike County | 13512 |
| 61 | Wright County | 13490 |
| 62 | Cooper County | 13296 |
| 63 | Dallas County | 12997 |
| 64 | New Madrid County | 12540 |
| 65 | Bates County | 12376 |
| 66 | Gasconade County | 11692 |
| 67 | Macon County | 11666 |
| 68 | Pemiscot County | 11628 |
| 69 | Moniteau County | 11527 |
| 70 | Livingston County | 11473 |
| 71 | Dent County | 11245 |
| 72 | Cedar County | 10641 |
| 73 | Osage County | 10254 |
| 74 | Mississippi County | 9942 |
| 75 | Madison County | 9748 |
| 76 | Linn County | 9110 |
| 77 | Douglas County | 9074 |
| 78 | DeKalb County | 8927 |
| 79 | Wayne County | 8859 |
| 80 | Montgomery County | 8848 |
| 81 | Barton County | 8773 |
| 82 | Ripley County | 8291 |
| 83 | Bollinger County | 8246 |
| 84 | Ralls County | 8090 |
| 85 | Howard County | 7903 |
| 86 | Lewis County | 7901 |
| 87 | Iron County | 7533 |
| 88 | Grundy County | 7358 |
| 89 | St. Clair County | 7310 |
| 90 | Ozark County | 6947 |
| 91 | Hickory County | 6926 |
| 92 | Caldwell County | 6773 |
| 93 | Oregon County | 6744 |
| 94 | Monroe County | 6714 |
| 95 | Carroll County | 6659 |
| 96 | Maries County | 6605 |
| 97 | Daviess County | 6252 |
| 98 | Harrison County | 6239 |
| 99 | Dade County | 5956 |
| 100 | Chariton County | 5750 |
| 101 | Shannon County | 5496 |
| 102 | Clark County | 5065 |
| 103 | Reynolds County | 4790 |
| 104 | Shelby County | 4611 |
| 105 | Sullivan County | 4599 |
| 106 | Gentry County | 4595 |
| 107 | Atchison County | 4168 |
| 108 | Carter County | 4071 |
| 109 | Putnam County | 3656 |
| 110 | Holt County | 3312 |
| 111 | Scotland County | 3311 |
| 112 | Schuyler County | 2990 |
| 113 | Knox County | 2838 |
| 114 | Mercer County | 2727 |
| 115 | Worth County | 1565 |