Illinois Congressional District 12

Voters

Registered Voters: 552,599
Active Voters: 523,095 (94.7%)

Party Registration

This state's voter file does not record party registration.

Turnout by Cycle

Cycle	General	Democratic Primary	Republican Primary
2025–2026	86,831 (15.7%)	<10 (—)	0 (0.0%)
2023–2024	372,534 (67.4%)	19,495 (3.5%)	94,282 (17.1%)
2021–2022	288,333 (52.2%)	20,670 (3.7%)	97,691 (17.7%)
2019–2020	342,530 (62.0%)	45,284 (8.2%)	81,487 (14.7%)
2017–2018	268,944 (48.7%)	38,071 (6.9%)	68,914 (12.5%)
2015–2016	294,440 (53.3%)	56,857 (10.3%)	108,739 (19.7%)
2013–2014	207,991 (37.6%)	24,041 (4.4%)	56,312 (10.2%)
2011–2012	241,016 (43.6%)	29,138 (5.3%)	53,095 (9.6%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

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Source: Civitech voter file snapshot as of 12/15/2025. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Citizen Population: 738,803
Citizen Voting Age Population (CVAP): 577,867

Citizen Population by Race/Ethnicity

Group	Citizens	Share
Non-Hispanic	719,480	97.4%
Hispanic	19,322	2.6%
White	655,858	88.8%
Black	35,898	4.9%
Asian	5,067	0.7%
American Indian / Alaska Native	793	0.1%
Native Hawaiian / Pacific Islander	63	0.0%
Two or More Races	2,321	0.3%

Citizen Voting Age Population by Race/Ethnicity

Group	CVAP	Share
Non-Hispanic	565,732	97.9%
Hispanic	12,131	2.1%
White	519,345	89.9%
Black	32,169	5.6%
Asian	5,050	0.9%
American Indian / Alaska Native	8,043	1.4%
Native Hawaiian / Pacific Islander	56	0.0%
Two or More Races	1,165	0.2%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation.