| Rank |
County |
Percentage with High School Diploma |
| 1 |
McLean County, Illinois
|
93.4%
|
| 2 |
Woodford County, Illinois
|
93.0%
|
| 3 |
Champaign County, Illinois
|
92.9%
|
| 4 |
Kendall County, Illinois
|
92.1%
|
| 5 |
DuPage County, Illinois
|
91.9%
|
| 6 |
Piatt County, Illinois
|
91.9%
|
| 7 |
McHenry County, Illinois
|
91.9%
|
| 8 |
McDonough County, Illinois
|
91.6%
|
| 9 |
Monroe County, Illinois
|
91.5%
|
| 10 |
Sangamon County, Illinois
|
91.5%
|
| 11 |
Grundy County, Illinois
|
91.3%
|
| 12 |
DeKalb County, Illinois
|
91.2%
|
| 13 |
Tazewell County, Illinois
|
90.9%
|
| 14 |
Marshall County, Illinois
|
90.7%
|
| 15 |
Menard County, Illinois
|
90.7%
|
| 16 |
Hancock County, Illinois
|
90.5%
|
| 17 |
Will County, Illinois
|
90.2%
|
| 18 |
Effingham County, Illinois
|
90.1%
|
| 19 |
Adams County, Illinois
|
89.9%
|
| 20 |
Jackson County, Illinois
|
89.9%
|
| 21 |
Jo Daviess County, Illinois
|
89.9%
|
| 22 |
Madison County, Illinois
|
89.8%
|
| 23 |
De Witt County, Illinois
|
89.8%
|
| 24 |
Jasper County, Illinois
|
89.7%
|
| 25 |
Coles County, Illinois
|
89.5%
|
| 26 |
Richland County, Illinois
|
89.3%
|
| 27 |
Stark County, Illinois
|
89.3%
|
| 28 |
Carroll County, Illinois
|
89.1%
|
| 29 |
Peoria County, Illinois
|
89.0%
|
| 30 |
Clark County, Illinois
|
89.0%
|
| 31 |
Stephenson County, Illinois
|
88.7%
|
| 32 |
Lake County, Illinois
|
88.6%
|
| 33 |
Edgar County, Illinois
|
88.6%
|
| 34 |
Schuyler County, Illinois
|
88.6%
|
| 35 |
Scott County, Illinois
|
88.5%
|
| 36 |
Bureau County, Illinois
|
88.5%
|
| 37 |
Jersey County, Illinois
|
88.5%
|
| 38 |
Williamson County, Illinois
|
88.4%
|
| 39 |
Bond County, Illinois
|
88.4%
|
| 40 |
St Clair County, Illinois
|
88.3%
|
| 41 |
Macoupin County, Illinois
|
88.3%
|
| 42 |
Edwards County, Illinois
|
88.2%
|
| 43 |
Shelby County, Illinois
|
88.2%
|
| 44 |
Clinton County, Illinois
|
88.1%
|
| 45 |
LaSalle County, Illinois
|
88.1%
|
| 46 |
Mercer County, Illinois
|
88.1%
|
| 47 |
Cumberland County, Illinois
|
88.0%
|
| 48 |
Putnam County, Illinois
|
88.0%
|
| 49 |
Ogle County, Illinois
|
87.9%
|
| 50 |
Henry County, Illinois
|
87.7%
|
| 51 |
Iroquois County, Illinois
|
87.7%
|
| 52 |
Morgan County, Illinois
|
87.4%
|
| 53 |
Wabash County, Illinois
|
87.3%
|
| 54 |
Henderson County, Illinois
|
87.2%
|
| 55 |
Pope County, Illinois
|
87.2%
|
| 56 |
Christian County, Illinois
|
87.1%
|
| 57 |
Washington County, Illinois
|
87.1%
|
| 58 |
Macon County, Illinois
|
87.1%
|
| 59 |
Ford County, Illinois
|
86.9%
|
| 60 |
Rock Island County, Illinois
|
86.8%
|
| 61 |
Whiteside County, Illinois
|
86.5%
|
| 62 |
Crawford County, Illinois
|
86.3%
|
| 63 |
Clay County, Illinois
|
86.0%
|
| 64 |
Lee County, Illinois
|
86.0%
|
| 65 |
Logan County, Illinois
|
85.9%
|
| 66 |
Kankakee County, Illinois
|
85.8%
|
| 67 |
Calhoun County, Illinois
|
85.8%
|
| 68 |
Vermilion County, Illinois
|
85.8%
|
| 69 |
Greene County, Illinois
|
85.6%
|
| 70 |
Warren County, Illinois
|
85.5%
|
| 71 |
Boone County, Illinois
|
85.5%
|
| 72 |
Jefferson County, Illinois
|
85.5%
|
| 73 |
Knox County, Illinois
|
85.4%
|
| 74 |
Winnebago County, Illinois
|
85.3%
|
| 75 |
White County, Illinois
|
85.3%
|
| 76 |
Marion County, Illinois
|
84.9%
|
| 77 |
Livingston County, Illinois
|
84.9%
|
| 78 |
Franklin County, Illinois
|
84.9%
|
| 79 |
Pike County, Illinois
|
84.9%
|
| 80 |
Massac County, Illinois
|
84.3%
|
| 81 |
Moultrie County, Illinois
|
84.3%
|
| 82 |
Montgomery County, Illinois
|
84.1%
|
| 83 |
Wayne County, Illinois
|
84.1%
|
| 84 |
Fulton County, Illinois
|
84.0%
|
| 85 |
Mason County, Illinois
|
83.8%
|
| 86 |
Cook County, Illinois
|
83.7%
|
| 87 |
Fayette County, Illinois
|
83.3%
|
| 88 |
Kane County, Illinois
|
83.1%
|
| 89 |
Perry County, Illinois
|
83.0%
|
| 90 |
Saline County, Illinois
|
82.8%
|
| 91 |
Union County, Illinois
|
82.6%
|
| 92 |
Hamilton County, Illinois
|
82.3%
|
| 93 |
Douglas County, Illinois
|
81.8%
|
| 94 |
Cass County, Illinois
|
81.8%
|
| 95 |
Johnson County, Illinois
|
80.5%
|
| 96 |
Brown County, Illinois
|
79.9%
|
| 97 |
Randolph County, Illinois
|
79.9%
|
| 98 |
Lawrence County, Illinois
|
79.3%
|
| 99 |
Hardin County, Illinois
|
78.9%
|
| 100 |
Gallatin County, Illinois
|
78.6%
|
| 101 |
Pulaski County, Illinois
|
78.2%
|
| 102 |
Alexander County, Illinois
|
75.8%
|