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, 2024

Piatt County had the highest high school graduate or higher, population 25 and over of 102 counties in 2024, at 96.3%. Brown County had the lowest, at 76.7%. The median was 91.6% and the figure for Illinois was 90.5%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest96.3Piatt County
Lowest76.7Brown County
Median91.6102 counties
Illinois90.5History

Map of counties, 2024

Adams County: 93.8 %Alexander County: 87.5 %Bond County: 90.1 %Boone County: 86.2 %Brown County: 76.7 %Bureau County: 91.5 %Calhoun County: 94.3 %Carroll County: 88.9 %Cass County: 86.4 %Champaign County: 95.1 %Christian County: 90.9 %Clark County: 92.5 %Clay County: 90.5 %Clinton County: 92.3 %Coles County: 91.1 %Cook County: 88.6 %Crawford County: 90.5 %Cumberland County: 94.1 %DeKalb County: 92.2 %De Witt County: 94 %Douglas County: 87.5 %DuPage County: 93 %Edgar County: 89.2 %Edwards County: 92 %Effingham County: 93 %Fayette County: 87.3 %Ford County: 91.6 %Franklin County: 89.6 %Fulton County: 90.6 %Gallatin County: 86.8 %Greene County: 91.2 %Grundy County: 93.8 %Hamilton County: 91.7 %Hancock County: 93.6 %Hardin County: 91.9 %Henderson County: 90.9 %Henry County: 92.4 %Iroquois County: 89.1 %Jackson County: 92.9 %Jasper County: 91.8 %Jefferson County: 92.4 %Jersey County: 94.1 %Jo Daviess County: 93.2 %Johnson County: 85.4 %Kane County: 87.4 %Kankakee County: 91.6 %Kendall County: 94 %Knox County: 89.9 %Lake County: 90.6 %LaSalle County: 91.8 %Lawrence County: 87 %Lee County: 91.2 %Livingston County: 88.6 %Logan County: 92.7 %McDonough County: 94.2 %McHenry County: 93.7 %McLean County: 95.9 %Macon County: 93.1 %Macoupin County: 91.4 %Madison County: 93.9 %Marion County: 90.7 %Marshall County: 91.5 %Mason County: 93 %Massac County: 90.7 %Menard County: 95 %Mercer County: 93.9 %Monroe County: 96 %Montgomery County: 90.2 %Morgan County: 89.5 %Moultrie County: 85.6 %Ogle County: 91.1 %Peoria County: 93.4 %Perry County: 85.9 %Piatt County: 96.3 %Pike County: 91.4 %Pope County: 92.6 %Pulaski County: 87.6 %Putnam County: 94.2 %Randolph County: 87.1 %Richland County: 91.5 %Rock Island County: 90.7 %St. Clair County: 93.5 %Saline County: 89.7 %Sangamon County: 94.1 %Schuyler County: 92.7 %Scott County: 92.4 %Shelby County: 94.9 %Stark County: 92.8 %Stephenson County: 92.6 %Tazewell County: 94.3 %Union County: 87.5 %Vermilion County: 91 %Wabash County: 92.8 %Warren County: 87.1 %Washington County: 92.9 %Wayne County: 89.6 %White County: 88.9 %Whiteside County: 91.9 %Will County: 91.8 %Williamson County: 92.8 %Winnebago County: 88.8 %Woodford County: 94.8 %
  • Under 89
  • 89 to 91
  • 91 to 92
  • 92 to 93
  • 93 to 94
  • 94 and over
%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2024

Piatt County: 96.3 %Piatt County96.3Monroe County: 96 %Monroe County96McLean County: 95.9 %McLean County95.9Champaign County: 95.1 %Champaign County95.1Menard County: 95 %Menard County95Shelby County: 94.9 %Shelby County94.9Woodford County: 94.8 %Woodford County94.8Calhoun County: 94.3 %Calhoun County94.3Tazewell County: 94.3 %Tazewell County94.3McDonough County: 94.2 %McDonough County94.2Putnam County: 94.2 %Putnam County94.2Jersey County: 94.1 %Jersey County94.1Cumberland County: 94.1 %Cumberland County94.1Sangamon County: 94.1 %Sangamon County94.1Kendall County: 94 %Kendall County94De Witt County: 94 %De Witt County94Mercer County: 93.9 %Mercer County93.9Madison County: 93.9 %Madison County93.9Adams County: 93.8 %Adams County93.8Grundy County: 93.8 %Grundy County93.8McHenry County: 93.7 %McHenry County93.7Hancock County: 93.6 %Hancock County93.6St. Clair County: 93.5 %St. Clair County93.5Peoria County: 93.4 %Peoria County93.4Jo Daviess County: 93.2 %Jo Daviess County93.2Macon County: 93.1 %Macon County93.1Effingham County: 93 %Effingham County93Mason County: 93 %Mason County93DuPage County: 93 %DuPage County93Washington County: 92.9 %Washington County92.9Jackson County: 92.9 %Jackson County92.9Wabash County: 92.8 %Wabash County92.8Williamson County: 92.8 %Williamson County92.8Stark County: 92.8 %Stark County92.8Schuyler County: 92.7 %Schuyler County92.7Logan County: 92.7 %Logan County92.7Pope County: 92.6 %Pope County92.6Stephenson County: 92.6 %Stephenson County92.6Clark County: 92.5 %Clark County92.5Henry County: 92.4 %Henry County92.4Piatt County: 96.3 %Piatt County96.3Monroe County: 96 %Monroe County96McLean County: 95.9 %McLean County95.9Champaign County: 95.1 %Champaign County95.1Menard County: 95 %Menard County95Shelby County: 94.9 %Shelby County94.9Woodford County: 94.8 %Woodford County94.8Calhoun County: 94.3 %Calhoun County94.3Tazewell County: 94.3 %Tazewell County94.3McDonough County: 94.2 %McDonough County94.2Putnam County: 94.2 %Putnam County94.2Jersey County: 94.1 %Jersey County94.1Cumberland County: 94.1 %Cumberland County94.1Sangamon County: 94.1 %Sangamon County94.1Kendall County: 94 %Kendall County94De Witt County: 94 %De Witt County94Mercer County: 93.9 %Mercer County93.9Madison County: 93.9 %Madison County93.9Adams County: 93.8 %Adams County93.8Grundy County: 93.8 %Grundy County93.8McHenry County: 93.7 %McHenry County93.7Hancock County: 93.6 %Hancock County93.6St. Clair County: 93.5 %St. Clair County93.5Peoria County: 93.4 %Peoria County93.4Jo Daviess County: 93.2 %Jo Daviess County93.2Macon County: 93.1 %Macon County93.1Effingham County: 93 %Effingham County93Mason County: 93 %Mason County93DuPage County: 93 %DuPage County93Washington County: 92.9 %Washington County92.9Jackson County: 92.9 %Jackson County92.9Wabash County: 92.8 %Wabash County92.8Williamson County: 92.8 %Williamson County92.8Stark County: 92.8 %Stark County92.8Schuyler County: 92.7 %Schuyler County92.7Logan County: 92.7 %Logan County92.7Pope County: 92.6 %Pope County92.6Stephenson County: 92.6 %Stephenson County92.6Clark County: 92.5 %Clark County92.5Henry County: 92.4 %Henry County92.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Piatt County96.3+0.2 pts
2Monroe County96+0.2 pts
3McLean County95.9+0.1 pts
4Champaign County95.1-0 pts
5Menard County95+0.8 pts
6Shelby County94.9+0.4 pts
7Woodford County94.8-0 pts
8Calhoun County94.3+0.9 pts
9Tazewell County94.3+0.3 pts
10McDonough County94.2-0.1 pts
10Putnam County94.2+0.6 pts
12Jersey County94.1+0.4 pts
13Cumberland County94.1+0.3 pts
13Sangamon County94.1+0.4 pts
15Kendall County94+0.4 pts
16De Witt County94+1.2 pts
17Mercer County93.9+0.6 pts
18Madison County93.9+0.2 pts
19Adams County93.8+0.4 pts
20Grundy County93.8-0.4 pts
21McHenry County93.7-0 pts
22Hancock County93.6-0.4 pts
23St. Clair County93.5+0.7 pts
24Peoria County93.4+0.1 pts
25Jo Daviess County93.2-0.3 pts
26Macon County93.10 pts
27Effingham County93-0.1 pts
28Mason County93+0.9 pts
29DuPage County93-0.2 pts
30Washington County92.9-0.3 pts
31Jackson County92.9+0.8 pts
32Wabash County92.8-0 pts
33Williamson County92.8+0.3 pts
34Stark County92.8+1 pts
35Schuyler County92.7+0.7 pts
36Logan County92.7+1.2 pts
37Pope County92.6+0.9 pts
38Stephenson County92.6+1.1 pts
39Clark County92.5+0.5 pts
40Henry County92.4+0.3 pts
41Jefferson County92.4+1 pts
41Scott County92.4-0.8 pts
43Clinton County92.3+0.2 pts
44DeKalb County92.2-0.1 pts
45Edwards County92+0.1 pts
46Hardin County91.9+3.5 pts
47Whiteside County91.9+0.9 pts
48LaSalle County91.8+0.5 pts
49Will County91.8+0.3 pts
50Jasper County91.8-1.3 pts
51Hamilton County91.7+2.6 pts
52Ford County91.6-0.3 pts
52Kankakee County91.6+0.6 pts
54Marshall County91.5+0.5 pts
55Richland County91.5-0.4 pts
56Bureau County91.5+0.5 pts
57Pike County91.4-0.4 pts
58Macoupin County91.4+0.5 pts
59Greene County91.2+0.8 pts
60Lee County91.2+0.7 pts
61Ogle County91.1+0.1 pts
62Coles County91.1-0.4 pts
63Vermilion County91+0.2 pts
64Henderson County90.9-1.2 pts
65Christian County90.9-0 pts
66Marion County90.7+0.4 pts
67Massac County90.7+1.4 pts
68Rock Island County90.7+0.4 pts
69Fulton County90.6-0.3 pts
70Lake County90.60 pts
71Crawford County90.5+2.4 pts
72Clay County90.5+2.8 pts
73Montgomery County90.2+0.2 pts
74Bond County90.1+0.8 pts
75Knox County89.9+0.6 pts
76Saline County89.7+1 pts
77Wayne County89.6-0.5 pts
78Franklin County89.6+0.4 pts
79Morgan County89.5-0.2 pts
80Edgar County89.2-0.9 pts
81Iroquois County89.1-0 pts
82White County88.9+2.4 pts
83Carroll County88.9+1.2 pts
84Winnebago County88.8+0.2 pts
85Livingston County88.6-1.7 pts
86Cook County88.6+0.2 pts
87Pulaski County87.6+0.2 pts
88Douglas County87.5+1.4 pts
89Union County87.5+0.4 pts
90Alexander County87.5+0.8 pts
91Kane County87.4+0.4 pts
92Fayette County87.3-0 pts
93Randolph County87.1-0.8 pts
94Warren County87.1+0.5 pts
95Lawrence County87+1.9 pts
96Gallatin County86.8+0.4 pts
97Cass County86.4-0.4 pts
98Boone County86.2+0.6 pts
99Perry County85.9+0.5 pts
100Moultrie County85.6-0.1 pts
101Johnson County85.4-0.6 pts
102Brown County76.7-2.9 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/2024/table-based-SF/data/5YRData/acsdt5y2024-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, 2024) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-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, 2024. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties. 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, 2024. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. Also distributed by Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties.

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, 2024 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat, via Invokely: https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_illinois_by_2024,
  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, 2024}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties. 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/2024/table-based-SF/data/5YRData/acsdt5y2024-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, 2024
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat
L2  - https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/illinois-counties.
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/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. Retrieved 2026-10-12.
ER  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Illinois by high school graduate or higher, population 25 and over using official data, and cite the source.
rank_places {"indicator":"high_school_graduate_share","level":"province","within":"Illinois","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=high_school_graduate_share&level=province&within=Illinois&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

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

Piatt County, with 96.3% in 2024, according to the U.S. Census Bureau.

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

Brown County, with 76.7% in 2024.

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