Illinois

Voter registration data provided by and in collaboration with L2 Data, a trusted provider of nonpartisan voter data.

For an explanation of L2's state-specific partisan breakdown estimates, CLICK HERE.

Percentages are rounded to the nearest hundredth decimal.

Last Updated: August 8, 2025.

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Primary Type

Congressional/State:

Open (Partisan)

Presidential:

Open (Partisan)

Party Registration Statistics

Total Registered Voters: 8,076,652

Democrats: 3,044,805 (37.70%)

Republicans: 2,223,314 (27.53%)

Unaffiliated: 2,808,533 (34.76%)

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Voters do not register with a political party.

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Election Litigation

None currently underway.

Major Parties

Democratic, Republican

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Independent & Electoral Reform Organizations

Illinois Ballot Integrity Project

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Who We Are

The Independent Voter Project (IVP) seeks to re-engage nonpartisan voters and promote nonpartisan election reform through initiatives, litigation, and voter education.

IVP is most well-known for authoring California's nonpartisan top-two primary which was passed by the voters in 2010. IVP also authored San Diego's successful Measure K, which passed in November 2016.

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