Primary Rules
How Iowa's Primary Works
Iowa uses a Closed Primary system
Closed Primary
Only voters registered with a political party can vote in that party's primary election. Independent and unaffiliated voters are excluded.
Voter file data: L2 Data · Registration counts: Iowa Secretary of State · Updated June 24, 2026
Iowa Voter Registration
& Party Affiliation Statistics
Total Registered
2,041,855
Largest Party
Republican (36.64%)
Independent / NPP
35.84%
Primary Type
Closed Primary
At a Glance
Iowa at a Glance
Key voter registration statistics · Updated 2026
Registered Voters
2,041,855
across 99 counties
Independent / NPP
731.9K
35.84% of registered
2024 Turnout
71%
of eligible voters
Registration
Voter Registration by Party
How many registered Democrats, Republicans, and Independents are in Iowa?
Democratic27.5%
Republican36.6%
Independent/Other35.8%
| Party | Registered Voters | % of Total |
|---|---|---|
Democratic | 561,827 | 27.5% |
Republican | 748,167 | 36.6% |
Independent/ | 731,861 | 35.8% |
Turnout
Voter Turnout in Iowa
How many eligible Iowa residents actually vote?
Recent Elections
| Election | Turnout | Voted |
|---|---|---|
| 2024 General | 71.0% | 1,674,011 |
| 2022 General | 52.0% | 1,230,417 |
| 2020 General | 72.0% | 1,700,130 |
| 2024 Presidential Primary | 5.4% | 110,272 |
| 2024 State Primary | Estimated ~17% of registered voters — Iowa SoS publishes a county-level turnout PDF (sos.iowa.gov) but no published statewide aggregate total; figure is derived from county-level summing | — |
Primary turnout figures reflect all voters regardless of party registration. Source: each state’s Secretary of State Statement of Vote.
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