Ranking of Illinois Counties By Population Aged 25 years and above with an Educational attainment of Some College or Associates Degree in 2021 (ACS-5Yrs)
Updated on September 3, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the population of Illinois (aged 25 years and above) who had an educational attainment of Some College or Associates Degree was 2,483,806. Among all Illinois counties, Cook County had the highest population (aged 25 years and above) with an educational attainment of Some College or Associates Degree (906,703), followed by DuPage County (158,756), and Will County (138,820).
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 Population (Aged 25yrs+) with an Educational Attainment of Some College or Associates Degree in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | Cook County | 906703 |
| 2 | DuPage County | 158756 |
| 3 | Will County | 138820 |
| 4 | Lake County | 114310 |
| 5 | Kane County | 93655 |
| 6 | McHenry County | 68660 |
| 7 | Madison County | 66106 |
| 8 | Winnebago County | 65354 |
| 9 | St. Clair County | 62306 |
| 10 | Sangamon County | 42677 |
| 11 | Peoria County | 39020 |
| 12 | Rock Island County | 35646 |
| 13 | Champaign County | 33614 |
| 14 | Tazewell County | 32519 |
| 15 | LaSalle County | 28423 |
| 16 | McLean County | 28312 |
| 17 | Kendall County | 28034 |
| 18 | Kankakee County | 24350 |
| 19 | Macon County | 23622 |
| 20 | DeKalb County | 20443 |
| 21 | Williamson County | 17379 |
| 22 | Vermilion County | 16808 |
| 23 | Adams County | 14639 |
| 24 | Whiteside County | 13608 |
| 25 | Ogle County | 12696 |
| 26 | Grundy County | 12313 |
| 27 | Knox County | 11896 |
| 28 | Henry County | 11836 |
| 29 | Stephenson County | 11776 |
| 30 | Jackson County | 11198 |
| 31 | Boone County | 10539 |
| 32 | Franklin County | 10515 |
| 33 | Jefferson County | 10466 |
| 34 | Coles County | 10352 |
| 35 | Macoupin County | 10306 |
| 36 | Marion County | 9912 |
| 37 | Clinton County | 9382 |
| 38 | Lee County | 9122 |
| 39 | Effingham County | 8827 |
| 40 | Fulton County | 8488 |
| 41 | Bureau County | 8217 |
| 42 | Woodford County | 8124 |
| 43 | Monroe County | 8042 |
| 44 | Livingston County | 7939 |
| 45 | Randolph County | 7422 |
| 46 | Christian County | 7138 |
| 47 | Morgan County | 6816 |
| 48 | Saline County | 6787 |
| 49 | Logan County | 6640 |
| 50 | Iroquois County | 6571 |
| 51 | Montgomery County | 6225 |
| 52 | Crawford County | 5527 |
| 53 | Perry County | 5333 |
| 54 | Jo Daviess County | 5182 |
| 55 | Fayette County | 5012 |
| 56 | Shelby County | 4993 |
| 57 | McDonough County | 4965 |
| 58 | Jersey County | 4903 |
| 59 | Richland County | 4588 |
| 60 | Hancock County | 4422 |
| 61 | Wayne County | 4261 |
| 62 | Bond County | 4174 |
| 63 | Massac County | 4034 |
| 64 | Douglas County | 4012 |
| 65 | Mercer County | 3977 |
| 66 | White County | 3932 |
| 67 | Edgar County | 3887 |
| 67 | Lawrence County | 3887 |
| 68 | Union County | 3878 |
| 69 | Washington County | 3636 |
| 70 | Carroll County | 3627 |
| 71 | Piatt County | 3590 |
| 72 | Clark County | 3517 |
| 73 | Warren County | 3493 |
| 74 | De Witt County | 3386 |
| 75 | Pike County | 3350 |
| 76 | Moultrie County | 3307 |
| 77 | Ford County | 3285 |
| 78 | Wabash County | 3255 |
| 79 | Menard County | 3246 |
| 80 | Johnson County | 3203 |
| 81 | Clay County | 3200 |
| 82 | Mason County | 3150 |
| 83 | Marshall County | 3023 |
| 84 | Cumberland County | 2581 |
| 85 | Greene County | 2544 |
| 86 | Jasper County | 2263 |
| 87 | Cass County | 2184 |
| 88 | Hamilton County | 2119 |
| 89 | Edwards County | 1961 |
| 90 | Schuyler County | 1940 |
| 91 | Henderson County | 1510 |
| 92 | Gallatin County | 1399 |
| 93 | Putnam County | 1384 |
| 94 | Alexander County | 1383 |
| 95 | Brown County | 1360 |
| 96 | Pulaski County | 1306 |
| 97 | Stark County | 1201 |
| 98 | Calhoun County | 1159 |
| 99 | Hardin County | 1091 |
| 100 | Scott County | 963 |
| 101 | Pope County | 914 |
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