Ranking of Missouri Counties By Population in 2020
Updated on June 18, 2025.
Based on the US Census Vintage data estimates, in 2020, the Population for Missouri was 6.16M. Among all Missouri counties, St. Louis County had the highest population (1.00M), followed by Jackson County (717.66K), and St. Charles County (406.42K).
The chart below shows the top 10 counties, and the table below shows the ranking of all Missouri counties.
You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.
Related Topics: Missouri Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage), 2020 Census.
See this for other years:
Ranking of Missouri Counties By Population in 2020
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| Rank | County | Population |
|---|---|---|
| 1 | St. Louis County | 1003376 |
| 2 | Jackson County | 717662 |
| 3 | St. Charles County | 406423 |
| 4 | St. Louis city | 300315 |
| 5 | Greene County | 299332 |
| 6 | Clay County | 254145 |
| 7 | Jefferson County | 226947 |
| 8 | Boone County | 184050 |
| 9 | Jasper County | 122896 |
| 10 | Cass County | 108162 |
| 11 | Platte County | 107190 |
| 12 | Franklin County | 104867 |
| 13 | Christian County | 89294 |
| 14 | Buchanan County | 84472 |
| 15 | Cape Girardeau County | 81824 |
| 16 | Cole County | 76624 |
| 17 | St. Francois County | 66446 |
| 18 | Lincoln County | 59857 |
| 19 | Newton County | 58699 |
| 20 | Taney County | 56064 |
| 21 | Johnson County | 54039 |
| 21 | Pulaski County | 54039 |
| 22 | Phelps County | 44568 |
| 23 | Callaway County | 44346 |
| 24 | Pettis County | 43004 |
| 25 | Camden County | 42807 |
| 26 | Butler County | 42063 |
| 27 | Howell County | 39806 |
| 28 | Webster County | 39008 |
| 29 | Scott County | 38022 |
| 30 | Lawrence County | 37998 |
| 31 | Laclede County | 36046 |
| 32 | Warren County | 35740 |
| 33 | Barry County | 34542 |
| 34 | Lafayette County | 33050 |
| 35 | Polk County | 31616 |
| 36 | Stone County | 31205 |
| 37 | Stoddard County | 28650 |
| 38 | Marion County | 28493 |
| 39 | Dunklin County | 28216 |
| 40 | Adair County | 25272 |
| 41 | Audrain County | 24781 |
| 42 | Miller County | 24778 |
| 43 | Randolph County | 24457 |
| 44 | Texas County | 24323 |
| 45 | Washington County | 23432 |
| 46 | Saline County | 23339 |
| 47 | McDonald County | 23278 |
| 48 | Ray County | 23135 |
| 49 | Crawford County | 23036 |
| 50 | Henry County | 21982 |
| 51 | Clinton County | 21218 |
| 52 | Morgan County | 21001 |
| 53 | Nodaway County | 20999 |
| 54 | Vernon County | 19675 |
| 55 | Benton County | 19425 |
| 56 | Perry County | 18971 |
| 57 | Ste. Genevieve County | 18478 |
| 58 | Wright County | 18214 |
| 59 | Andrew County | 18102 |
| 60 | Pike County | 17413 |
| 61 | Dallas County | 17132 |
| 62 | Cooper County | 16647 |
| 63 | New Madrid County | 16329 |
| 64 | Bates County | 16053 |
| 65 | Pemiscot County | 15589 |
| 66 | Moniteau County | 15216 |
| 67 | Macon County | 15199 |
| 68 | Gasconade County | 14763 |
| 69 | Dent County | 14389 |
| 70 | Cedar County | 14214 |
| 71 | Livingston County | 13990 |
| 72 | Osage County | 13255 |
| 73 | Madison County | 12625 |
| 74 | Mississippi County | 12121 |
| 75 | Linn County | 11857 |
| 76 | Barton County | 11623 |
| 77 | Douglas County | 11600 |
| 78 | DeKalb County | 11596 |
| 79 | Montgomery County | 11286 |
| 80 | Wayne County | 10935 |
| 81 | Ripley County | 10670 |
| 82 | Bollinger County | 10555 |
| 83 | Ralls County | 10354 |
| 84 | Howard County | 10157 |
| 85 | Lewis County | 10039 |
| 86 | Grundy County | 9757 |
| 87 | Iron County | 9513 |
| 88 | St. Clair County | 9346 |
| 89 | Caldwell County | 8821 |
| 90 | Monroe County | 8693 |
| 91 | Oregon County | 8611 |
| 92 | Ozark County | 8519 |
| 93 | Carroll County | 8464 |
| 94 | Maries County | 8451 |
| 95 | Daviess County | 8433 |
| 96 | Hickory County | 8298 |
| 97 | Harrison County | 8157 |
| 98 | Dade County | 7586 |
| 99 | Chariton County | 7390 |
| 100 | Shannon County | 7035 |
| 101 | Clark County | 6658 |
| 102 | Gentry County | 6136 |
| 103 | Shelby County | 6095 |
| 104 | Reynolds County | 6079 |
| 105 | Sullivan County | 5976 |
| 106 | Atchison County | 5305 |
| 107 | Carter County | 5205 |
| 108 | Scotland County | 4705 |
| 109 | Putnam County | 4685 |
| 110 | Holt County | 4191 |
| 111 | Schuyler County | 4010 |
| 112 | Knox County | 3739 |
| 113 | Mercer County | 3512 |
| 114 | Worth County | 1968 |