United States congressional districts over time
Districts change as a result of population shifts recorded by the census and political gerrymandering. Hit the play button to see how districts have changed over time.
Congressional district
Undistricted state area
Areas without congressional representation during the Civil War and Reconstruction
Contiguous U.S. territories that are not yet states
Contiguous U.S.
Source: Jeffrey B. Lewis, Brandon DeVine, Lincoln Pitcher, and Kenneth C. Martis. (2013)
Digital Boundary Definitions of United States Congressional Districts, 1789–2012.
Retrieved from
cdmaps.polisci.ucla.edu
in June 2026.
© Encyclopædia Britannica
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1st Congress
119th Congress