Ranking of Missouri Counties By Population Aged 25 years and above with an Educational attainment of High School Graduate or Equivalent in 2021 (ACS-5Yrs)
Updated on September 3, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the population of Missouri (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 1,276,601. Among all Missouri counties, St. Louis County had the highest population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (146,718), followed by Jackson County (136,438), and St. Charles County (63,606).
The chart below shows the top 10 Missouri counties, and the table below shows the ranking of all Missouri counties.
You can see similar information for other educational attainments.
You can also see similar information for other states and for the United States.
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Related Topics: Missouri ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Missouri Counties By Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | St. Louis County | 146718 |
| 2 | Jackson County | 136438 |
| 3 | St. Charles County | 63606 |
| 4 | Greene County | 54625 |
| 5 | St. Louis city | 53352 |
| 6 | Jefferson County | 49883 |
| 7 | Clay County | 46008 |
| 8 | Jasper County | 27173 |
| 9 | Franklin County | 24440 |
| 10 | Cass County | 23709 |
| 11 | Boone County | 23120 |
| 12 | Buchanan County | 22170 |
| 13 | St. Francois County | 18093 |
| 14 | Christian County | 17079 |
| 15 | Cape Girardeau County | 16792 |
| 16 | Lincoln County | 15996 |
| 17 | Cole County | 15884 |
| 18 | Platte County | 15714 |
| 19 | Newton County | 13968 |
| 20 | Taney County | 13331 |
| 21 | Camden County | 11953 |
| 22 | Butler County | 11641 |
| 23 | Callaway County | 11086 |
| 24 | Howell County | 10653 |
| 25 | Laclede County | 10256 |
| 26 | Barry County | 10080 |
| 27 | Pettis County | 9988 |
| 28 | Lafayette County | 9885 |
| 28 | Lawrence County | 9885 |
| 29 | Johnson County | 9840 |
| 30 | Scott County | 9829 |
| 31 | Webster County | 9724 |
| 32 | Warren County | 9183 |
| 33 | Pulaski County | 8972 |
| 34 | Stoddard County | 8741 |
| 35 | Phelps County | 8411 |
| 36 | Stone County | 8150 |
| 37 | Dunklin County | 7676 |
| 38 | Polk County | 7620 |
| 39 | Audrain County | 7418 |
| 40 | Ray County | 7353 |
| 41 | Texas County | 7101 |
| 42 | Marion County | 7041 |
| 43 | McDonald County | 6768 |
| 44 | Washington County | 6687 |
| 45 | Miller County | 6666 |
| 46 | Henry County | 6663 |
| 47 | Randolph County | 6574 |
| 48 | Pike County | 6468 |
| 49 | Crawford County | 6365 |
| 50 | Clinton County | 6330 |
| 51 | Benton County | 6065 |
| 52 | Morgan County | 5913 |
| 53 | Saline County | 5822 |
| 54 | Dallas County | 5666 |
| 55 | Bates County | 5329 |
| 56 | Vernon County | 5320 |
| 57 | Perry County | 5319 |
| 58 | New Madrid County | 5223 |
| 59 | Wright County | 5193 |
| 60 | Ste. Genevieve County | 4927 |
| 61 | Pemiscot County | 4804 |
| 62 | Macon County | 4756 |
| 63 | Andrew County | 4713 |
| 64 | Nodaway County | 4654 |
| 65 | Adair County | 4610 |
| 66 | Cooper County | 4517 |
| 67 | Moniteau County | 4475 |
| 68 | Livingston County | 4355 |
| 69 | Mississippi County | 4303 |
| 70 | Gasconade County | 4298 |
| 71 | Dent County | 4246 |
| 72 | DeKalb County | 3965 |
| 73 | Cedar County | 3857 |
| 74 | Osage County | 3821 |
| 75 | Linn County | 3776 |
| 76 | Bollinger County | 3699 |
| 77 | Madison County | 3643 |
| 78 | Ralls County | 3594 |
| 79 | Wayne County | 3548 |
| 80 | Montgomery County | 3507 |
| 81 | Douglas County | 3431 |
| 82 | Barton County | 3266 |
| 83 | Ripley County | 3131 |
| 84 | Hickory County | 3115 |
| 85 | Lewis County | 2979 |
| 86 | Monroe County | 2966 |
| 87 | St. Clair County | 2837 |
| 88 | Oregon County | 2733 |
| 89 | Iron County | 2714 |
| 90 | Caldwell County | 2697 |
| 91 | Carroll County | 2674 |
| 92 | Ozark County | 2655 |
| 93 | Harrison County | 2575 |
| 94 | Grundy County | 2461 |
| 95 | Chariton County | 2430 |
| 96 | Dade County | 2400 |
| 97 | Shannon County | 2396 |
| 98 | Maries County | 2371 |
| 99 | Daviess County | 2286 |
| 100 | Howard County | 2255 |
| 101 | Clark County | 2053 |
| 102 | Sullivan County | 1986 |
| 103 | Carter County | 1910 |
| 104 | Gentry County | 1783 |
| 105 | Shelby County | 1774 |
| 106 | Reynolds County | 1738 |
| 107 | Atchison County | 1688 |
| 108 | Holt County | 1469 |
| 109 | Putnam County | 1404 |
| 110 | Schuyler County | 1322 |
| 111 | Scotland County | 1223 |
| 112 | Knox County | 1120 |
| 113 | Mercer County | 1042 |
| 114 | Worth County | 693 |