MO · sourced voting rules
How elections work
in Missouri
Rules that shape registration and voting, the officials responsible for administering them, and the gaps that still require an election-specific source.
Make your voting plan
MissouriDates for November 3
Download calendar ↓Partial coverage: only the dated entries below have been checked. Confirm other deadlines and exceptions with your election office.
| Action | Date | Details and source |
|---|---|---|
| Register online | Passed | Regular online registration deadline; check the official source for later options. Official source ↗ |
| Register by mail | Passed | Registration deadline; confirm mail receipt and postmark requirements with the election office. Official source ↗ |
| Register in person | Passed | Regular registration deadline; check the official source for later registration options. Official source ↗ |
Checked 2026-10-16. Confirm local details and exceptions with your election office.
Background registration and voting policy
State policy snapshot · not legal advice
Registration, primary, and voting methods
These values preserve the wording in the March 2026 EAC/NCSL profile. Asterisks and qualifications are meaningful; confirm the current election notice before acting.
Not established by this source
The current EAC/NCSL comparison profile does not provide a complete statewide RCV rule field. Election.org does not infer one.
Not established by this source
Eligibility, filing, and counting rules can be election-specific. Use the official state election website.
Read the election notice
The primary-system field above is published. A complete contest-by-contest threshold rule is not.
Address and election required
A statewide rules profile cannot establish a voter's complete local specimen ballot.
Source: U.S. Election Assistance Commission / NCSL State Election Profile for Missouri ↗ · published March 2026 · verified 2026-08-24. Confirm current election details ↗