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: L2 Data · Updated August 23, 2026
Illinois Voter Registration
& Party Affiliation Statistics
Total Registered
8,430,173
Most Active Primary Party
Independent (41.77%)
Independent / NPP
41.77%
Primary Type
Open Primary
At a Glance
Illinois at a Glance
Key voter registration statistics · Updated 2026
Registered Voters
8,430,173
across 102 counties
Independent / NPP
3.5M
41.77% of registered
2024 Turnout
63.5%
of eligible voters
Primary Participation
Primary Ballot Participation by Party
Illinois does not register voters by party. The breakdown below is modeled from recent primary ballot history.
Democratic38.3%
Republican19.9%
Independent41.8%
Other0.0%
| Party | Registered Voters | % of Total |
|---|---|---|
Democratic | 3,226,866 | 38.3% |
Republican | 1,678,733 | 19.9% |
Independent | 3,521,415 | 41.8% |
Other | 3,159 | 0.0% |
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.
votercount.aiNew · Betain collaboration with L2 Data
The numbers above are just the start.
Ask the voter file anything — in plain English — and get real answers back, not a spreadsheet.
Compare Gen Z and Boomer party registration in Florida.
Gen Z is far more likely to register Non-Partisan than Boomers — it’s their single largest category.
Party registration · Florida
Share of each generation
Republican
Boomers44.8%
Gen Z30.6%
Non-Partisan
Boomers20.4%
Gen Z33.5%
Democratic
Boomers32.3%
Gen Z30.3%
Boomers lean heavily Republican — nearly 45% are registered Republican, the dominant party by a wide margin.Gen Z is far more likely to be Non-Partisan (33.5%) than Boomers (20.4%).
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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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