Ranking of Illinois Counties By Percentage of 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 percentage of the population of Illinois (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 25.40%. Among all Illinois counties, Greene County had the highest percentage of its population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (44.59%), followed by Scott County (44.43%), and Pope County (43.17%).
The chart below shows the top 10 Illinois counties, and the table below shows the ranking of all Illinois 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: Illinois ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Illinois Counties By Percentage of Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
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| Rank | County | Percentage of Population (Aged 25yrs+) (%) |
|---|---|---|
| 1 | Greene County | 44.59 |
| 2 | Scott County | 44.43 |
| 3 | Pope County | 43.17 |
| 4 | Henderson County | 42.86 |
| 5 | Shelby County | 42.79 |
| 6 | De Witt County | 42.01 |
| 7 | Livingston County | 41.94 |
| 8 | Christian County | 41.80 |
| 9 | Cass County | 41.77 |
| 10 | Pike County | 41.31 |
| 11 | Vermilion County | 41.05 |
| 12 | Fayette County | 41.02 |
| 13 | Mason County | 40.95 |
| 14 | Calhoun County | 40.61 |
| 15 | Macoupin County | 40.46 |
| 16 | Pulaski County | 39.95 |
| 17 | Montgomery County | 39.90 |
| 18 | Putnam County | 39.69 |
| 19 | Marshall County | 39.22 |
| 20 | Gallatin County | 39.18 |
| 21 | Clay County | 39.17 |
| 22 | Stark County | 39.09 |
| 23 | Cumberland County | 38.95 |
| 24 | Morgan County | 38.87 |
| 25 | Schuyler County | 38.57 |
| 26 | Edgar County | 38.53 |
| 27 | Iroquois County | 38.51 |
| 28 | Mercer County | 38.47 |
| 29 | Randolph County | 38.42 |
| 30 | Brown County | 38.28 |
| 31 | Whiteside County | 37.89 |
| 32 | Alexander County | 37.73 |
| 33 | Jasper County | 37.58 |
| 34 | Clark County | 37.33 |
| 35 | Jersey County | 37.30 |
| 36 | Perry County | 37.04 |
| 37 | Fulton County | 36.95 |
| 38 | Lawrence County | 36.65 |
| 39 | Carroll County | 36.23 |
| 40 | Jo Daviess County | 35.73 |
| 41 | Logan County | 35.65 |
| 42 | Bureau County | 35.51 |
| 43 | LaSalle County | 35.45 |
| 44 | Macon County | 35.40 |
| 45 | Union County | 35.30 |
| 46 | Ford County | 35.24 |
| 47 | Knox County | 35.19 |
| 48 | Marion County | 34.95 |
| 49 | Adams County | 34.92 |
| 50 | Kankakee County | 34.80 |
| 51 | Wayne County | 34.79 |
| 52 | Massac County | 34.74 |
| 53 | Lee County | 34.64 |
| 54 | Henry County | 34.43 |
| 55 | Edwards County | 34.41 |
| 55 | Hancock County | 34.41 |
| 56 | Douglas County | 34.25 |
| 57 | Hardin County | 34.20 |
| 58 | White County | 34.11 |
| 59 | Ogle County | 34.08 |
| 60 | Menard County | 33.81 |
| 61 | Warren County | 33.77 |
| 62 | Stephenson County | 33.55 |
| 63 | Wabash County | 33.22 |
| 64 | Washington County | 33.13 |
| 65 | Moultrie County | 33.09 |
| 66 | McDonough County | 32.89 |
| 67 | Effingham County | 32.81 |
| 68 | Franklin County | 32.73 |
| 69 | Bond County | 32.72 |
| 70 | Clinton County | 32.66 |
| 71 | Johnson County | 32.59 |
| 72 | Boone County | 32.49 |
| 73 | Hamilton County | 32.34 |
| 74 | Coles County | 32.28 |
| 75 | Piatt County | 32.05 |
| 76 | Jefferson County | 31.72 |
| 77 | Grundy County | 31.70 |
| 78 | Winnebago County | 31.31 |
| 79 | Richland County | 31.22 |
| 80 | Tazewell County | 30.35 |
| 81 | Williamson County | 29.83 |
| 82 | Rock Island County | 29.62 |
| 83 | Saline County | 29.15 |
| 84 | Madison County | 29.02 |
| 85 | Crawford County | 28.92 |
| 86 | Woodford County | 28.06 |
| 87 | Sangamon County | 27.65 |
| 88 | Peoria County | 27.42 |
| 89 | St. Clair County | 27.33 |
| 90 | McHenry County | 25.99 |
| 91 | Will County | 25.97 |
| 92 | Monroe County | 25.59 |
| 93 | DeKalb County | 25.26 |
| 94 | Kendall County | 24.65 |
| 95 | McLean County | 23.27 |
| 96 | Jackson County | 22.89 |
| 97 | Kane County | 22.59 |
| 98 | Cook County | 22.43 |
| 99 | Champaign County | 21.37 |
| 100 | Lake County | 20.14 |
| 101 | DuPage County | 18.10 |