Data / Rankings / High school graduate or higher, population 25 and over / Counties in Illinois

Counties in Illinois by high school graduate or higher, population 25 and over

Piatt County had the highest high school graduate or higher, population 25 and over of 102 counties in 2023, at 96%. Brown County had the lowest, at 79.6%. The median was 91.4% and the figure for Illinois was 90.3%. Source: the U.S. Census Bureau.

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Highest96Piatt County
Lowest79.6Brown County
Median91.4102 counties
Illinois90.3History

Map of counties, 2023

Adams County: 93.5 %Alexander County: 86.7 %Bond County: 89.3 %Boone County: 85.6 %Brown County: 79.6 %Bureau County: 91 %Calhoun County: 93.4 %Carroll County: 87.7 %Cass County: 86.7 %Champaign County: 95.1 %Christian County: 90.9 %Clark County: 92 %Clay County: 87.7 %Clinton County: 92 %Coles County: 91.5 %Cook County: 88.3 %Crawford County: 88.2 %Cumberland County: 93.9 %DeKalb County: 92.4 %De Witt County: 92.8 %Douglas County: 86.1 %DuPage County: 93.2 %Edgar County: 90.1 %Edwards County: 91.9 %Effingham County: 93.2 %Fayette County: 87.3 %Ford County: 91.9 %Franklin County: 89.2 %Fulton County: 90.9 %Gallatin County: 86.4 %Greene County: 90.4 %Grundy County: 94.2 %Hamilton County: 89 %Hancock County: 94 %Hardin County: 88.5 %Henderson County: 92.1 %Henry County: 92.1 %Iroquois County: 89.1 %Jackson County: 92.1 %Jasper County: 93.1 %Jefferson County: 91.4 %Jersey County: 93.7 %Jo Daviess County: 93.4 %Johnson County: 85.9 %Kane County: 87 %Kankakee County: 91 %Kendall County: 93.6 %Knox County: 89.3 %Lake County: 90.6 %LaSalle County: 91.4 %Lawrence County: 85.1 %Lee County: 90.5 %Livingston County: 90.3 %Logan County: 91.5 %McDonough County: 94.3 %McHenry County: 93.7 %McLean County: 95.8 %Macon County: 93.1 %Macoupin County: 90.8 %Madison County: 93.7 %Marion County: 90.3 %Marshall County: 91 %Mason County: 92.1 %Massac County: 89.3 %Menard County: 94.2 %Mercer County: 93.3 %Monroe County: 95.8 %Montgomery County: 90 %Morgan County: 89.6 %Moultrie County: 85.7 %Ogle County: 91 %Peoria County: 93.4 %Perry County: 85.4 %Piatt County: 96 %Pike County: 91.8 %Pope County: 91.7 %Pulaski County: 87.4 %Putnam County: 93.6 %Randolph County: 87.9 %Richland County: 91.9 %Rock Island County: 90.2 %St. Clair County: 92.7 %Saline County: 88.8 %Sangamon County: 93.7 %Schuyler County: 92 %Scott County: 93.2 %Shelby County: 94.5 %Stark County: 91.7 %Stephenson County: 91.5 %Tazewell County: 94 %Union County: 87 %Vermilion County: 90.7 %Wabash County: 92.8 %Warren County: 86.6 %Washington County: 93.2 %Wayne County: 90.2 %White County: 86.5 %Whiteside County: 91 %Will County: 91.5 %Williamson County: 92.4 %Winnebago County: 88.7 %Woodford County: 94.8 %
  • Under 88
  • 88 to 90
  • 90 to 91
  • 91 to 92
  • 92 to 94
  • 94 and over
%, 2023. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2023

Piatt County: 96 %Piatt County96McLean County: 95.8 %McLean County95.8Monroe County: 95.8 %Monroe County95.8Champaign County: 95.1 %Champaign County95.1Woodford County: 94.8 %Woodford County94.8Shelby County: 94.5 %Shelby County94.5McDonough County: 94.3 %McDonough County94.3Grundy County: 94.2 %Grundy County94.2Menard County: 94.2 %Menard County94.2Hancock County: 94 %Hancock County94Tazewell County: 94 %Tazewell County94Cumberland County: 93.9 %Cumberland County93.9McHenry County: 93.7 %McHenry County93.7Jersey County: 93.7 %Jersey County93.7Sangamon County: 93.7 %Sangamon County93.7Madison County: 93.7 %Madison County93.7Kendall County: 93.6 %Kendall County93.6Putnam County: 93.6 %Putnam County93.6Adams County: 93.5 %Adams County93.5Jo Daviess County: 93.4 %Jo Daviess County93.4Calhoun County: 93.4 %Calhoun County93.4Peoria County: 93.4 %Peoria County93.4Mercer County: 93.3 %Mercer County93.3DuPage County: 93.2 %DuPage County93.2Scott County: 93.2 %Scott County93.2Washington County: 93.2 %Washington County93.2Effingham County: 93.2 %Effingham County93.2Jasper County: 93.1 %Jasper County93.1Macon County: 93.1 %Macon County93.1Wabash County: 92.8 %Wabash County92.8De Witt County: 92.8 %De Witt County92.8St. Clair County: 92.7 %St. Clair County92.7Williamson County: 92.4 %Williamson County92.4DeKalb County: 92.4 %DeKalb County92.4Mason County: 92.1 %Mason County92.1Henry County: 92.1 %Henry County92.1Jackson County: 92.1 %Jackson County92.1Henderson County: 92.1 %Henderson County92.1Clark County: 92 %Clark County92Clinton County: 92 %Clinton County92Piatt County: 96 %Piatt County96McLean County: 95.8 %McLean County95.8Monroe County: 95.8 %Monroe County95.8Champaign County: 95.1 %Champaign County95.1Woodford County: 94.8 %Woodford County94.8Shelby County: 94.5 %Shelby County94.5McDonough County: 94.3 %McDonough County94.3Grundy County: 94.2 %Grundy County94.2Menard County: 94.2 %Menard County94.2Hancock County: 94 %Hancock County94Tazewell County: 94 %Tazewell County94Cumberland County: 93.9 %Cumberland County93.9McHenry County: 93.7 %McHenry County93.7Jersey County: 93.7 %Jersey County93.7Sangamon County: 93.7 %Sangamon County93.7Madison County: 93.7 %Madison County93.7Kendall County: 93.6 %Kendall County93.6Putnam County: 93.6 %Putnam County93.6Adams County: 93.5 %Adams County93.5Jo Daviess County: 93.4 %Jo Daviess County93.4Calhoun County: 93.4 %Calhoun County93.4Peoria County: 93.4 %Peoria County93.4Mercer County: 93.3 %Mercer County93.3DuPage County: 93.2 %DuPage County93.2Scott County: 93.2 %Scott County93.2Washington County: 93.2 %Washington County93.2Effingham County: 93.2 %Effingham County93.2Jasper County: 93.1 %Jasper County93.1Macon County: 93.1 %Macon County93.1Wabash County: 92.8 %Wabash County92.8De Witt County: 92.8 %De Witt County92.8St. Clair County: 92.7 %St. Clair County92.7Williamson County: 92.4 %Williamson County92.4DeKalb County: 92.4 %DeKalb County92.4Mason County: 92.1 %Mason County92.1Henry County: 92.1 %Henry County92.1Jackson County: 92.1 %Jackson County92.1Henderson County: 92.1 %Henderson County92.1Clark County: 92 %Clark County92Clinton County: 92 %Clinton County92
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Piatt County96+2.2 pts
2McLean County95.8-0.1 pts
3Monroe County95.8+0.1 pts
4Champaign County95.1+0.5 pts
5Woodford County94.8+0.6 pts
6Shelby County94.5+0.6 pts
7McDonough County94.3-0.2 pts
8Grundy County94.2+0.2 pts
9Menard County94.2-0.8 pts
10Hancock County94-0.4 pts
11Tazewell County94+0.3 pts
12Cumberland County93.9+0.5 pts
13McHenry County93.7-0.2 pts
14Jersey County93.7+0.4 pts
14Sangamon County93.7+0.5 pts
16Madison County93.7+0.4 pts
17Kendall County93.6+0.2 pts
18Putnam County93.6-0 pts
19Adams County93.5+0.1 pts
20Jo Daviess County93.4-0.1 pts
21Calhoun County93.4+1.4 pts
22Peoria County93.4+0.5 pts
23Mercer County93.3+0.9 pts
24DuPage County93.2-0.3 pts
25Scott County93.2+0.4 pts
25Washington County93.2+0.7 pts
27Effingham County93.2-0.4 pts
28Jasper County93.1-0.2 pts
29Macon County93.1+0.7 pts
30Wabash County92.8-0.2 pts
31De Witt County92.8-1.4 pts
32St. Clair County92.7+0.5 pts
33Williamson County92.4-0.3 pts
34DeKalb County92.4-0.7 pts
35Mason County92.1+0.8 pts
36Henry County92.1-0.4 pts
36Jackson County92.1+0.2 pts
38Henderson County92.1-0.9 pts
39Clark County92-0.2 pts
39Clinton County920 pts
41Schuyler County92+0.4 pts
42Richland County91.9-0.2 pts
43Ford County91.9+0.2 pts
44Edwards County91.9+0.8 pts
45Pike County91.8+0.8 pts
46Pope County91.7+3.5 pts
47Stark County91.7+0.8 pts
48Coles County91.5-0.5 pts
48Logan County91.5-0 pts
48Will County91.5-0.1 pts
51Stephenson County91.5-0.3 pts
52Jefferson County91.4+0.8 pts
52LaSalle County91.4+0.3 pts
54Ogle County91-0.3 pts
55Marshall County91-1 pts
55Whiteside County91+0.2 pts
57Bureau County91+0.7 pts
57Kankakee County91+1 pts
59Christian County90.9+0.5 pts
60Fulton County90.9+1 pts
61Macoupin County90.8-0.1 pts
62Vermilion County90.7+0.2 pts
63Lake County90.6-0.2 pts
64Lee County90.5+0.5 pts
65Greene County90.40 pts
66Marion County90.3+0.4 pts
67Livingston County90.3-0.2 pts
68Rock Island County90.2+0.6 pts
69Wayne County90.2+0.9 pts
70Edgar County90.1+2.1 pts
71Montgomery County90+0.2 pts
72Morgan County89.60 pts
73Knox County89.3+0.6 pts
74Bond County89.3+0.4 pts
75Massac County89.3+1.6 pts
76Franklin County89.2-0.7 pts
77Iroquois County89.1+0.4 pts
78Hamilton County89+2.7 pts
79Saline County88.8+0.6 pts
80Winnebago County88.7+0.1 pts
81Hardin County88.5+1.1 pts
82Cook County88.3+0.1 pts
83Crawford County88.2-0.5 pts
84Randolph County87.9+1.8 pts
85Clay County87.7-0.4 pts
86Carroll County87.7-0.7 pts
87Pulaski County87.4-0.7 pts
88Fayette County87.3+0.7 pts
89Union County87-0.9 pts
90Kane County87+0.5 pts
91Cass County86.7+0.6 pts
92Alexander County86.7+0.3 pts
93Warren County86.6-0.9 pts
94White County86.5-1.9 pts
95Gallatin County86.4-0.8 pts
96Douglas County86.1+1.3 pts
97Johnson County85.9+1.3 pts
98Moultrie County85.7-0.7 pts
99Boone County85.6-1 pts
100Perry County85.4+0.8 pts
101Lawrence County85.1-0 pts
102Brown County79.6-0.7 pts

Other periods

About this ranking

People aged 25 and over who hold a regular high school diploma, a GED or alternative credential, or any higher level of education, as a percentage of all people aged 25 and over. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

Measures the adult population, not students: it is not the high school graduation rate of a class. Not comparable with the EU share below upper secondary education, which covers ages 25 to 64.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs (Counties in Illinois by high school graduate or higher, population 25 and over, 2023) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat

MLA 9

American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Illinois by high school graduate or higher, population 25 and over, 2023. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat. Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties?period=2023. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. Counties in Illinois by high school graduate or higher, population 25 and over, 2023. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat. Also distributed by Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties?period=2023.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Illinois by high school graduate or higher, population 25 and over, 2023 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat, via Invokely: https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_illinois_by_2023,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Illinois by high school graduate or higher, population 25 and over, 2023}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties?period=2023. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary\_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Illinois by high school graduate or higher, population 25 and over, 2023
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat
L2  - https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties?period=2023.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat. Retrieved 2026-10-12.
ER  -
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Rank Counties in Illinois by high school graduate or higher, population 25 and over using official data, and cite the source.
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Questions

Which county has the highest high school graduate or higher, population 25 and over?

Piatt County, with 96% in 2023, according to the U.S. Census Bureau.

Which county has the lowest high school graduate or higher, population 25 and over?

Brown County, with 79.6% in 2023.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. Retrieved 2026-10-12.

High school graduate or higher, population 25 and over: other rankings

Counties in Illinois: more rankings