WHAT IS THE VOTER REGISTRATION GAP?

In Illinois, 45% of 18-year-olds are registered to vote, compared to 85% of voters 45+

Teens have the power to close the gap.

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National

Illinois Voter Registration Gap

This maps shows the most recent county-level voter registration rates in Illinois, one of a set of 39 states we currently track. Rates are shown for both 18-year-olds and adults ages 45 and older. Click a county to learn more about voter registration in there.

State
County
Age Group

Illinois

45% of 18-year-olds are registered to vote as of May 13, 2026.

85%75%65%55%45%35%LowPop
Voter data from a commercial source compiling official state records and the American Community Survey. Last updated on Jul 14, 2026.
Learn more about this information.
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High school communities can close the gap in Illinois.

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Illinois County Registration Rates

This table shows the voter registration rates in each Illinois county or county-equivalent as of May 13, 2026. We omit counties with 18-year-old populations below 100.

See our methods for more details.

18 vs 45+
Adams County36%> 90%78064,754
Bond County19%88%45316,716
Boone County54%84%75253,230
Bureau County57%79%35932,866
Carroll County89%88%12715,576
Cass County36%83%12712,784
Champaign County14%88%7,084208,741
Christian County76%82%30533,538
Clark County56%> 90%14415,266
Clay County58%> 90%15213,052
Clinton County47%> 90%34536,954
Coles County22%> 90%1,12546,777
Cook County43%80%61,7145,182,090
Crawford County59%85%16618,511
DeKalb County24%> 90%2,527100,703
De Witt County> 90%89%12115,373
Douglas County54%83%23119,751
DuPage County56%87%11,077930,024
Edgar County53%88%15016,535
Effingham County66%> 90%34134,522
Fayette County15%84%28021,315
Ford County44%88%13213,406
Franklin County67%> 90%34337,323
Fulton County50%> 90%30033,020
Greene County77%> 90%10311,683
Grundy County65%> 90%58753,219
Hancock County58%86%15717,281
Henry County70%> 90%47548,643
Iroquois County62%88%26826,449
Jackson County25%> 90%1,36953,064
Jasper County50%> 90%1189,180
Jefferson County34%86%38436,550
Jersey County45%> 90%27121,274
Jo Daviess County59%> 90%17921,851
Johnson County54%85%16013,376
Kane County54%74%6,823517,255
Kankakee County34%86%1,589106,635
Kendall County64%> 90%1,873137,675
Knox County33%86%75449,046
Lake County43%86%11,146714,223
LaSalle County50%90%1,172108,714
Lawrence County48%82%15015,031
Lee County49%88%29433,869
Livingston County52%86%37835,565
Logan County43%85%32727,713
McDonough County12%> 90%83326,920
McHenry County52%88%3,748312,591
McLean County25%> 90%4,199171,556
Macon County43%> 90%1,210101,849
Macoupin County57%> 90%49544,350
Madison County36%> 90%3,782264,238
Marion County50%88%38037,000
Mason County44%> 90%12612,745
Massac County41%> 90%12513,865
Mercer County45%89%17615,495
Monroe County63%> 90%32235,036
Montgomery County65%83%26727,942
Morgan County24%88%65433,021
Moultrie County50%83%13514,424
Ogle County54%89%61351,495
Peoria County39%90%2,370179,645
Perry County37%89%29420,639
Piatt County74%> 90%15116,695
Pike County74%> 90%14014,469
Randolph County62%83%27730,058
Richland County58%> 90%15615,598
Rock Island County42%79%1,896142,757
St. Clair County49%> 90%3,045253,694
Saline County64%84%19323,213
Sangamon County56%> 90%2,176194,947
Shelby County74%90%18520,720
Stephenson County58%82%42343,768
Tazewell County54%86%1,371130,290
Union County41%85%19716,997
Vermilion County52%84%77172,386
Wabash County66%85%13011,119
Warren County29%> 90%32716,447
Washington County50%> 90%16513,627
Wayne County50%> 90%17915,973
White County82%> 90%11813,619
Whiteside County57%87%55354,947
Will County56%86%9,268701,462
Williamson County65%> 90%58766,876
Winnebago County61%85%3,235283,292
Woodford County45%> 90%48838,312

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About this information

The voter data shown on this page comes from a commercial source that compiles official state records and was last updated on Jul 14, 2026. Population estimates come from the American Community Survey. To learn more, read our research model.

These pages are offered for guidance only and are not intended as legal advice. Please consult state election officials or an attorney if you have questions about any particular situation. We hope you find this useful. To cite our resources and original research, please provide links and/or cite The Civics Center.

If you have a question or noticed a discrepancy, please contact us.

© 2026 The Civics Center

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The Voter Registration Gap in Illinois | The Civics Center