Elections in Missouri are held to fill various local, state and federal seats. Special elections may be held to fill vacancies at other points in time.
In a 2020 study, Missouri was ranked as the 3rd hardest state for citizens to vote in, based on registration and identification requirements, and convenience provisions.[1]
Congressional and legislative districting is performed by legislative committee following the release of the decennial United States census.
See main article: Political party strength in Missouri. Missouri performed non-partisan voter registration prior to 2023.
Residents have been allowed to register online to vote or update their registration online since 2014, but only using mobile or touchscreen computers.[2] 17.5-year-old residents may preregister to vote.[3] Starting in 2023, an optional question on voters' party affiliation was added to voter registration forms statewide.
Absentee ballots may only be requested with a provided excuse and by mail or fax (with a copy of acceptable photo ID) by the second Wednesday prior to an election. In-person absentee voting is allowed from the second Tuesday prior to an election, with acceptable photo ID required at early voting locations.[4]
See main article: List of Missouri ballot measures. The General Assembly may refer a any measure, including constitutional amendments, to a ballot measure with simple majorities of both houses in a single session. Residents may initiate ballot measures, including referendums and constitutional amendments. Constitutional amendments may be initiated by a minimum number of valid signatures from the equivalent of 8% of votes cast in the last gubernatorial election from each of two-thirds of the state's congressional districts.
See main article: United States presidential elections in Missouri.