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Voting history · Missouri

Missouri

A dated list of changes to how Americans vote: district maps, polling places and drop boxes, voting laws and rules, and courts and election officials. Each entry says who did what and when, shows what became of it, and links to the page it rests on. Attempts that failed are listed as failed. Entries that rest on a news report name the outlet.

This is the state view: events recorded for Missouri, then national events that apply here. See the national timeline.

Congressional districts in Missouri

Choose a district to see the events tagged to it. A number after the district is how many events name it.

Kind of event
Decade

In Missouri

2026

  1. Nov 3, 2026 State Maps and lines Pending

    Proposition A on the November 3, 2026 ballot: voters decide whether H.B. 1 takes effect

    Missouri voters will decide Proposition A, the referendum on H.B. 1. KMBC reports that a “yes” vote upholds H.B. 1 and the 2025 districts, and a “no” vote repeals it and keeps the 2022 map. The 2022 map is the one in use for the November 3 general election.

    Related: Missouri Supreme Court orders H.B. 1 referendum onto the ballot and bars use of the 2025 map until voters approve it · Supreme Court stays Eighth Circuit order; Missouri's 2022 map stays in use for November 2026 · H.B. 1 redraws Missouri's Fifth Congressional District

    Source last checked Oct 23, 2026

2025

  1. Sep 28, 2025 State Maps and lines Enacted

    Governor signs H.B. 1, a new congressional map passed in an extraordinary session

    In an extraordinary session called by Governor Mike Kehoe, the General Assembly passed H.B. 1, which repealed the 2022 map and enacted new boundaries; the session adjourned on September 12, 2025. The bill passed 21 to 11 in the Senate and 90 to 65 in the House. Governor Kehoe signed it on September 28, 2025. It had no emergency clause, so it could take effect only 90 days after the session adjourned, according to the Eighth Circuit's September 21, 2026 opinion.

    Related: Missouri enacts its 2022 congressional map (H.B. 2909) · H.B. 1 redraws Missouri's Fifth Congressional District · Organizers file referendum petition against H.B. 1 with more than 300,000 signatures · Missouri Supreme Court rules the General Assembly may redraw congressional districts mid-decade · Missouri Supreme Court orders H.B. 1 referendum onto the ballot and bars use of the 2025 map until voters approve it

    Source last checked Oct 23, 2026

  2. Sep 28, 2025 Congressional district: MO-5 Maps and lines Enacted

    H.B. 1 redraws Missouri's Fifth Congressional District

    The Eighth Circuit wrote that the most prominent changes in the 2025 map related to Missouri's Fifth Congressional District. KMBC reported that the map split Kansas City's District 5. The Missouri Supreme Court later held that the map has never taken effect and will not unless voters approve it.

    Related: Governor signs H.B. 1, a new congressional map passed in an extraordinary session · Proposition A on the November 3, 2026 ballot: voters decide whether H.B. 1 takes effect

    Source last checked Oct 21, 2026

2022

  1. 2022 State Maps and lines Enacted

    Missouri enacts its 2022 congressional map (H.B. 2909)

    After the 2020 Census apportioned Missouri eight seats, the General Assembly passed H.B. 2909, which became law on the governor's signature and set the congressional districts used in the 2022 and 2024 primary and general elections.

    Related: Governor signs H.B. 1, a new congressional map passed in an extraordinary session

    Source last checked Oct 20, 2026

2020

  1. Nov 3, 2020 State Maps and lines Enacted

    Missouri voters pass Amendment 3, replacing the 2018 Clean Missouri state legislative redistricting system

    On November 3, 2020, Missouri voters passed Amendment 3, which ended the state legislative redistricting system voters had backed in 2018. Under it, bipartisan commissions or appellate judges draw state legislative maps, with compactness moved up the list of criteria. St. Louis Public Radio reported it passing with 51% with 98% of votes counted.

    Source last checked Oct 21, 2026

2011

  1. May 4, 2011 State Maps and lines Enacted

    Missouri Legislature overrides veto and adopts H.B. 193 congressional map for eight districts

    After the 2010 Census Missouri lost a seat and had to draw eight districts. Both houses approved a map in H.B. 193 in April 2011, Governor Jay Nixon vetoed it, and the General Assembly voted to override the veto and adopted the map on May 4, 2011.

    Related: Missouri Supreme Court reinstates challenges to the 2011 congressional map · Missouri Supreme Court upholds the 2011 congressional map after trial

    Source last checked Oct 24, 2026

Nationwide

2026

  1. Sep 10, 2026 National Maps and lines Proposed

    Census Bureau proposes residence criteria for the 2030 census that would exclude some noncitizens from the apportionment count

    On September 10, 2026 the Census Bureau, an agency of the Department of Commerce, published a proposed rule in the Federal Register (91 FR 57524, Docket No. 260903-0005, RIN 0607-AA75) that would add two new parts to the Code of Federal Regulations: residence criteria for the decennial census, and standards and restrictions for demographic questions on the census questionnaire. On residence, the notice states that "the Census Bureau proposes to include lawful permanent residents within the apportionment base, while excluding from the apportionment base illegal aliens and aliens whose legal status is less durable and indefinite in length than lawful permanent resident status," and says it is considering using administrative records to determine legal status. The comment period, first set to end October 13, 2026, was extended to November 2, 2026 by a notice published October 5, 2026. Al Jazeera and CNBC reported on the proposal, and CNBC reported that opponents expect litigation.

    Source last checked Oct 22, 2026

2021

  1. Aug 12, 2021 National Maps and lines Settled

    Census Bureau releases 2020 redistricting data for states

    On August 12, 2021, the Census Bureau released the 2020 Census Redistricting Data (Public Law 94-171) Summary File, which it described as delivering data for states to begin redistricting. On September 16, 2021, it released the same data in an easier-to-use format on data.census.gov and delivered a toolkit to states.

    Source last checked Oct 22, 2026

  2. Apr 26, 2021 National Maps and lines Settled

    Census Bureau announces 2020 Census apportionment results

    On April 26, 2021, the Census Bureau announced that the 2020 Census resident population of the United States on April 1, 2020 was 331,449,281, and that Commerce Secretary Gina Raimondo delivered the population counts used for apportionment of the U.S. House to the President.

    Source last checked Oct 29, 2026

1967

  1. Dec 14, 1967 National Maps and lines Enacted

    Congress requires single-member congressional districts (Public Law 90-196)

    Public Law 90-196, approved December 14, 1967, provides that in each state entitled to more than one Representative "there shall be established by law a number of districts equal to the number of Representatives to which such State is so entitled," with "no district to elect more than one Representative."

    Source last checked Oct 20, 2026

How this timeline is built

Every entry rests on at least one source that was opened and read, and that source states the date and the fact. Courts, legislatures, election offices, the Justice Department, the Census Bureau, the Federal Register and Congress.gov come first. A news report is used only when no official page states the fact, and it is labeled with the outlet's name. Encyclopedias are not used as sources. History starts in 1965 with the Voting Rights Act. County names come from the Census Bureau's 2024 Gazetteer. Congressional district numbers are those in use for the 2026 election; an event is tagged to a district only when its source names that congressional district.

When a later event changes an earlier one, such as a law later struck down, both entries are listed and point to each other. This page does not predict outcomes or say which party a change helps. U.S. House maps for 2026 · Back to the 2026 voting center.