Illinois Congressional District 04

Voters

Registered Voters: 400,278
Active Voters: 379,396 (94.8%)

Party Registration

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

Turnout by Cycle

Cycle	General	Democratic Primary	Republican Primary
2025–2026	30,926 (7.7%)	<10 (—)	0 (0.0%)
2023–2024	219,052 (54.7%)	43,683 (10.9%)	12,289 (3.1%)
2021–2022	133,388 (33.3%)	42,384 (10.6%)	13,867 (3.5%)
2019–2020	219,770 (54.9%)	85,335 (21.3%)	7,777 (1.9%)
2017–2018	155,401 (38.8%)	69,323 (17.3%)	11,631 (2.9%)
2015–2016	183,762 (45.9%)	99,845 (24.9%)	25,077 (6.3%)
2013–2014	96,067 (24.0%)	20,456 (5.1%)	12,995 (3.2%)
2011–2012	125,575 (31.4%)	27,651 (6.9%)	13,734 (3.4%)

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: 605,489
Citizen Voting Age Population (CVAP): 438,237

Citizen Population by Race/Ethnicity

Group	Citizens	Share
Non-Hispanic	232,402	38.4%
Hispanic	373,087	61.6%
White	166,694	27.5%
Black	34,074	5.6%
Asian	24,595	4.1%
American Indian / Alaska Native	271	0.0%
Native Hawaiian / Pacific Islander	84	0.0%
Two or More Races	643	0.1%

Citizen Voting Age Population by Race/Ethnicity

Group	CVAP	Share
Non-Hispanic	191,219	43.6%
Hispanic	247,018	56.4%
White	139,980	31.9%
Black	29,310	6.7%
Asian	20,264	4.6%
American Indian / Alaska Native	1,479	0.3%
Native Hawaiian / Pacific Islander	85	0.0%
Two or More Races	542	0.1%

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