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Voter file data: L2 Data · Registration counts: Illinois Secretary of State · Updated May 4, 2026

Illinois Voter Registration

& Party Affiliation Statistics

Total Registered
8,399,862
Largest Party
Democratic (38.51%)
Independent / NPP
41.32%
Primary Type
Open Primary
OverviewRegistrationPrimary RulesTurnout
At a Glance

Illinois at a Glance

Key voter registration statistics · Updated 2026

Registered Voters
8,399,862
across 102 counties
Registration Rate
83.3%
eligible population
No Party Preference
41.32%
of registered voters
2024 Turnout
63.3%
of eligible voters
Registration

Voter Registration by Party

How many registered Democrats, Republicans, and Independents are in Illinois?

38.51%
20.17%
41.32%
Democratic38.51%
Republican20.17%
Independent/Other41.32%
PartyRegistered Voters% of Total
Democratic
3,235,08438.51%
Republican
1,693,99220.17%
Independent/Other
3,470,78641.32%
Primary Rules

How Illinois's Primary Works

Illinois uses a Open Primary system

⚖
Open Primary
Any registered voter can vote in any party's primary, regardless of their own party affiliation or registration status.
How It Works
On election day, voters choose which party's ballot they want. They don't need to be registered with that party. In most open primary states, this choice is made privately at the polling place.
IVP's Position
Better than closed primaries, but still forces voters to pick a party's ballot rather than voting for the best candidate regardless of party.
See all primary systems by state →
Turnout

Voter Turnout in Illinois

How many eligible Illinois residents actually vote?

Eligible vs Registered
83.3% registered
8,399,862 registered10,079,834 eligible
1,679,972 eligible residents are not registered to vote.
Recent Elections
ElectionTurnoutVoted
2024 General63.3%5,705,246
2022 General45.9%4,144,125
2020 General66.5%6,050,000
2024 Presidential Primary16.7%1,404,551
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