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.
Registration counts: Voter Count · Updated November 11, 2026
Illinois Voter Registration
& Party Affiliation Statistics
Total Registered
8,413,939
Most Active Primary Party
Democratic (40.25%)
Independent / NPP
39.39%
Primary Type
Open Primary
All data provided by
(opens votercount.ai in a new tab)The only AI tool connected to L2’s industry-leading national voter file.
Ask about any county, age group, or district in Illinois, in plain English, and get answers in seconds.
At a Glance
Illinois at a Glance
Key voter registration statistics · Updated 2026
Registered Voters
8,413,939
across 102 counties
Independent / NPP
3.3M
39.39% of registered
2024 Turnout
63.5%
of eligible voters
49.50% of voters in LaSalle County have no modeled party lean, compared with 39.39% across Illinois. That's the highest share of any Illinois county with at least 50,000 voters. Illinois doesn't register voters by party, so these figures are modeled.
Answered directly from the voter file with Voter Count
Primary Participation
Primary Ballot Participation by Party
Illinois does not register voters by party. The breakdown below is modeled from recent primary ballot history.
Democratic40.3%
Republican20.3%
Independent39.4%
Other0.1%
| Party | Registered Voters | % of Total |
|---|---|---|
Democratic | 3,386,619 | 40.3% |
Republican | 1,707,915 | 20.3% |
Independent | 3,313,955 | 39.4% |
Other | 5,450 | 0.1% |
Note: Illinois does not collect party affiliation at voter registration. These figures are modeled from L2 voter-file analysis of which primary ballot each voter pulled in recent cycles — they reflect primary participation, not party registration.
Turnout
Voter Turnout in Illinois
How many eligible Illinois residents actually vote?
Recent Elections
| Election | Turnout | Voted |
|---|---|---|
| 2024 General | 63.5% | 5,705,246 |
| 2022 General | 45.9% | 4,144,125 |
| 2020 General | 66.5% | 6,050,000 |
| 2024 Presidential Primary | 16.7% | 1,404,551 |
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All data provided by
(opens votercount.ai in a new tab)The only AI tool connected to L2’s industry-leading national voter file.
Ask about any county, age group, or district in Illinois, in plain English, and get answers in seconds.