The tabs below represent the state legislative years associated with the state legislative districts collected by the U.S. Census Bureau through the Redistricting Data Program. The state legislative district plans in effect for a specific legislative year are those boundaries in effect for that year’s election. Plan updates are collected every two years, and typically, new products are generated only for state legislative districts with changes. 

Changes to state legislative district plans are submitted to the Census Bureau by non-partisan state liaisons, identified by the governor and legislative leadership of each state at the beginning of each decade's Redistricting Data Program. Once these plans are processed and inserted into the MAF/TIGER database, the Census Bureau generates verification materials for each state to review and certify as accurate. Any reported changes to the verification materials were incorporated into these final products.

State legislative districts are generally included as part of the standard set of geographies for which decennial census and American Community Survey (ACS) 5-Year estimates data are produced. These data are available on data.census.gov. Selected other data products produced specifically for congressional and state legislative districts are referenced in the relevant tabs below, and are also available from data.census.gov.