WHAT IS THE VOTER REGISTRATION GAP?

In Illinois, 48% 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
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Illinois

48% of 18-year-olds are registered to vote as of Jun 22, 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 Aug 11, 2026.
Learn more about this information.
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Illinois County Registration Rates

This table shows the voter registration rates in each Illinois county or county-equivalent as of Jun 22, 2026. We omit counties with 18-year-old populations below 100.

See our methods for more details.

18 vs 45+
Adams County44%> 90%78064,754
Bond County21%88%45316,716
Boone County58%84%75253,230
Bureau County62%79%35932,866
Carroll County86%88%12715,576
Cass County35%83%12712,784
Champaign County14%88%7,084208,741
Christian County75%82%30533,538
Clark County66%> 90%14415,266
Clay County63%> 90%15213,052
Clinton County56%> 90%34536,954
Coles County23%> 90%1,12546,777
Cook County46%81%61,7145,182,090
Crawford County67%85%16618,511
DeKalb County26%> 90%2,527100,703
De Witt County> 90%89%12115,373
Douglas County58%83%23119,751
DuPage County59%87%11,077930,024
Edgar County62%88%15016,535
Effingham County66%> 90%34134,522
Fayette County18%84%28021,315
Ford County56%88%13213,406
Franklin County68%> 90%34337,323
Fulton County56%> 90%30033,020
Greene County83%> 90%10311,683
Grundy County72%> 90%58753,219
Hancock County61%86%15717,281
Henry County76%> 90%47548,643
Iroquois County74%88%26826,449
Jackson County24%> 90%1,36953,064
Jasper County52%> 90%1189,180
Jefferson County39%86%38436,550
Jersey County47%> 90%27121,274
Jo Daviess County64%> 90%17921,851
Johnson County56%85%16013,376
Kane County57%74%6,823517,255
Kankakee County36%86%1,589106,635
Kendall County66%> 90%1,873137,675
Knox County34%87%75449,046
Lake County46%86%11,146714,223
LaSalle County53%> 90%1,172108,714
Lawrence County53%82%15015,031
Lee County52%88%29433,869
Livingston County58%86%37835,565
Logan County47%85%32727,713
McDonough County14%> 90%83326,920
McHenry County55%88%3,748312,591
McLean County26%> 90%4,199171,556
Macon County46%> 90%1,210101,849
Macoupin County64%> 90%49544,350
Madison County41%> 90%3,782264,238
Marion County57%88%38037,000
Mason County49%> 90%12612,745
Massac County41%> 90%12513,865
Mercer County55%89%17615,495
Monroe County69%> 90%32235,036
Montgomery County69%83%26727,942
Morgan County28%88%65433,021
Moultrie County58%84%13514,424
Ogle County59%89%61351,495
Peoria County42%90%2,370179,645
Perry County41%85%29420,639
Piatt County84%> 90%15116,695
Pike County83%> 90%14014,469
Randolph County68%83%27730,058
Richland County62%> 90%15615,598
Rock Island County45%79%1,896142,757
St. Clair County53%> 90%3,045253,694
Saline County66%84%19323,213
Sangamon County60%> 90%2,176194,947
Shelby County75%90%18520,720
Stephenson County61%82%42343,768
Tazewell County60%86%1,371130,290
Union County51%86%19716,997
Vermilion County56%84%77172,386
Wabash County73%85%13011,119
Warren County28%> 90%32716,447
Washington County56%> 90%16513,627
Wayne County57%> 90%17915,973
White County88%> 90%11813,619
Whiteside County63%88%55354,947
Will County60%86%9,268701,462
Williamson County68%> 90%58766,876
Winnebago County65%85%3,235283,292
Woodford County49%> 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 Aug 11, 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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