Ranking of Missouri Counties By Population Aged 25 years and above with an Educational attainment of Less than High School Diploma 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 Less than High School Diploma was 377,539. Among all Missouri counties, Jackson County had the highest population (aged 25 years and above) with an educational attainment of Less than High School Diploma (41,977), followed by St. Louis County (41,053), and St. Louis city (23,488).
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 Less than High School Diploma in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | Jackson County | 41977 |
| 2 | St. Louis County | 41053 |
| 3 | St. Louis city | 23488 |
| 4 | Jefferson County | 14532 |
| 5 | Greene County | 13820 |
| 6 | St. Charles County | 12718 |
| 7 | Clay County | 10957 |
| 8 | Jasper County | 9967 |
| 9 | Franklin County | 7286 |
| 10 | St. Francois County | 6683 |
| 11 | Buchanan County | 6079 |
| 12 | Boone County | 5542 |
| 13 | Cass County | 4884 |
| 14 | Butler County | 4625 |
| 15 | Christian County | 4443 |
| 16 | Newton County | 4288 |
| 17 | Cape Girardeau County | 4250 |
| 18 | Cole County | 3981 |
| 19 | Dunklin County | 3932 |
| 20 | Taney County | 3849 |
| 21 | Howell County | 3843 |
| 22 | Stoddard County | 3804 |
| 23 | Lawrence County | 3777 |
| 24 | Scott County | 3739 |
| 25 | Barry County | 3629 |
| 26 | Lincoln County | 3596 |
| 27 | Pettis County | 3576 |
| 28 | McDonald County | 3397 |
| 29 | Callaway County | 3321 |
| 30 | Laclede County | 3263 |
| 31 | Washington County | 3226 |
| 32 | Webster County | 3198 |
| 33 | Crawford County | 3074 |
| 34 | Morgan County | 3067 |
| 35 | Warren County | 2920 |
| 36 | Camden County | 2817 |
| 37 | Phelps County | 2629 |
| 38 | Texas County | 2626 |
| 39 | Platte County | 2428 |
| 40 | Stone County | 2394 |
| 41 | Johnson County | 2228 |
| 42 | Audrain County | 2220 |
| 43 | Polk County | 2190 |
| 44 | Lafayette County | 2181 |
| 45 | Pemiscot County | 2118 |
| 46 | Wright County | 2065 |
| 47 | New Madrid County | 2036 |
| 48 | Marion County | 1999 |
| 49 | Saline County | 1960 |
| 50 | Benton County | 1953 |
| 51 | Randolph County | 1884 |
| 52 | Miller County | 1869 |
| 53 | Mississippi County | 1849 |
| 54 | Perry County | 1801 |
| 55 | Henry County | 1783 |
| 56 | Ray County | 1713 |
| 57 | Pulaski County | 1667 |
| 58 | Dent County | 1659 |
| 59 | Pike County | 1617 |
| 60 | Dallas County | 1538 |
| 61 | Moniteau County | 1523 |
| 62 | Wayne County | 1505 |
| 63 | Vernon County | 1410 |
| 64 | Ripley County | 1400 |
| 65 | Douglas County | 1376 |
| 66 | Cedar County | 1359 |
| 67 | Bates County | 1321 |
| 68 | Cooper County | 1268 |
| 69 | Gasconade County | 1251 |
| 70 | Livingston County | 1238 |
| 71 | Ozark County | 1200 |
| 72 | Iron County | 1197 |
| 73 | Bollinger County | 1168 |
| 74 | Montgomery County | 1134 |
| 75 | Ste. Genevieve County | 1130 |
| 76 | Adair County | 1109 |
| 77 | Madison County | 1091 |
| 78 | Oregon County | 1037 |
| 79 | Grundy County | 1030 |
| 80 | Reynolds County | 1014 |
| 81 | Macon County | 1010 |
| 82 | Barton County | 990 |
| 83 | Clinton County | 974 |
| 84 | Lewis County | 962 |
| 85 | DeKalb County | 892 |
| 86 | Maries County | 857 |
| 87 | Linn County | 828 |
| 88 | Andrew County | 813 |
| 89 | St. Clair County | 809 |
| 90 | Howard County | 798 |
| 91 | Osage County | 743 |
| 92 | Shannon County | 735 |
| 93 | Nodaway County | 729 |
| 94 | Daviess County | 718 |
| 95 | Hickory County | 707 |
| 96 | Ralls County | 699 |
| 97 | Caldwell County | 647 |
| 98 | Clark County | 621 |
| 99 | Sullivan County | 617 |
| 100 | Scotland County | 614 |
| 101 | Gentry County | 593 |
| 102 | Dade County | 592 |
| 103 | Carroll County | 576 |
| 104 | Monroe County | 557 |
| 105 | Harrison County | 488 |
| 106 | Carter County | 478 |
| 107 | Shelby County | 474 |
| 108 | Chariton County | 452 |
| 109 | Atchison County | 387 |
| 110 | Knox County | 328 |
| 111 | Mercer County | 305 |
| 112 | Schuyler County | 280 |
| 113 | Putnam County | 192 |
| 114 | Holt County | 184 |
| 115 | Worth County | 121 |
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