Redistricting in Missouri
The following timeline is a high-level overview outlining major redistricting events and activity in the state of Missouri over the last 10 years.
Congressional Timeline

2011
Census data delivered to Missouri.

Republicans in the state legislature gerrymandered the congressional map after Missouri lost one seat in reapportionment, the process of redistributing Congressional seats after each decennial census.

Democratic Governor Jay Nixon vetoed the gerrymandered map.
The legislature overrode the governor’s veto to put the maps in place.
State Legislature Timeline
The following timeline is a high-level overview outlining major redistricting events and activity in the state of Missouri over the last 10 years.

2011
Census data delivered to Missouri.
Bipartisan commissions met to draw the state legislative lines.
The commissions failed to reach an agreement.

Missouri Supreme Court appointed a new nonpartisan commission, which produced a new state map.

2012
Litigation invalidated the 2011 map for the state Senate.
A new bipartisan commission met and redrew the state Senate map.

2018
Missouri voters passed Amendment 1, a redistricting reform measure that will establish a non-partisan process for drawing state legislative districts.