Voter file data: L2 Data · Registration counts: Missouri Secretary of State · Updated May 16, 2026

Missouri Voter Registration

& Party Affiliation Statistics

Total Registered

4,121,740

Most Active Primary Party

Republican (48.56%)

Independent / NPP

18.08%

Primary Type

State:Open Primary

Pres:Closed Primary

Overview Registration Primary Rules Turnout

At a Glance

Missouri at a Glance

Key voter registration statistics · Updated 2026

Registered Voters

4,121,740

across 115 counties

Independent / NPP

18.08%

of registered voters

2024 Turnout

64.6%

of eligible voters

Primary Participation

Primary Ballot Participation by Party

Missouri does not register voters by party. The breakdown below is modeled from recent primary ballot history.

33.36%

48.56%

18.08%

Democratic33.36%

Republican48.56%

Independent/Other18.08%

Party	Registered Voters	% of Total
Democratic	1,375,215	33.36%
Republican	2,001,499	48.56%
Independent/Other	745,026	18.08%

Note: Missouri 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.

Primary Rules

How Missouri's Primary Works

Missouri uses different primary rules for state/congressional and presidential elections

State / Congressional

⚖

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 →

Presidential

⚖

Closed Primary

Only voters registered with a political party can vote in that party's primary election. Independent and unaffiliated voters are excluded.

How It Works

Voters must register with a party, often weeks or months before the election, to participate. If you're registered as independent or unaffiliated, you cannot vote in either major party's primary.

IVP's Position

Closed primaries lock millions of independent voters out of the elections that matter most. In many districts, the primary is the only competitive election.

See all primary systems by state →

Turnout

Voter Turnout in Missouri

How many eligible Missouri residents actually vote?

Recent Elections

Election	Turnout	Voted
2024 General	64.6%	3,000,000
2022 General	49.7%	2,304,250
2020 General	65.5%	3,026,028
2024 Presidential Primary	N/A — Missouri repealed its state-run presidential primary (HB 1878, June 2022). R held a closed party-administered caucus (March 2, 2024); D held a party-administered primary (March 23, 2024). No statewide vote aggregate published; delegate counts only.	—
2024 State Primary	22.1%	988,173

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