State Legislative Districts
State Legislative Districts
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.
2026
The Census Bureau collects congressional and state legislative district plans from all states every two years, corresponding to the sessions of the U.S. Congress. The information on this page reflects the state legislative district plans as submitted by the state assigned non-partisan liaisons in Phase 4 of the Redistricting Data Program, i.e. those in effect for the 2026 election cycle. Four states (Alabama, Michigan, Minnesota, and Mississippi) delineated new state legislative district-upper (SLDU) chamber plans for the 2026 election cycle. Two states (Minnesota and Mississippi) delineated new state legislative district-lower (SLDL) chamber plans for the 2026 election cycle. All other states, the District of Columbia, and Puerto Rico had no changes to their state legislative district (SLD) boundaries from the 2024 cycle.
Data Products
Coming December 2026: 2020 Census 120th Congressional District Summary File (includes 2026 State Legislative Districts)
The 120th Congressional District Summary File (CD120) contains data for state legislative and congressional districts compiled from the questions asked of all people and about every housing unit in the 2020 Census. Population items include age, sex, race, Hispanic or Latino origin, household type, family type, relationship to householder, group quarters population, housing occupancy and housing tenure (whether a housing unit is owner-occupied or renter-occupied).
The file contains subject content identical to that shown in the 2020 Census Demographic and Housing Characteristics File (DHC), which was released in May 2023, but only includes geographies related to the 120th Congressional and the 2026 State Legislative Districts.
American Community Survey 5-Year Estimates Data
The American Community Survey (ACS) produces data for state legislative districts (SLDs) annually, as part of the 5-year estimates data releases. ACS data for the 2026 SLDs will not be released until December 2027. These data will be available on data.census.gov. Currently data for the 2024 SLDs are available.
Geographic Products
TIGER/Line Shapefiles, Geodatabases, and GeoPackages
These TIGER/Line products include the 2026 State Legislative Districts, the 120th Congressional Districts, and other geography effective as of January 1, 2026. The congressional and state legislative district boundaries are the boundaries as submitted by the state liaisons in Phase 4 of the Redistricting Data Program and in effect for the 2026 election cycle.
If the boundary of a congressional or state legislative district split a 2020 Census tabulation block, the Census Bureau's annual TIGER/Line products will depict the correct location (showing the block split) of the boundary.
The geographic files for the 120th Congressional and 2026 State Legislative Districts are identified by their abbreviation within the file name: "cd120" for the 120th congressional districts; "sldu" for the state legislative districts - upper house; and "sldl" for the state legislative districts - lower house.
These products are released on a flow basis. Geodatabases are generally released first, followed by shapefiles and geopackages.
2026 State Legislative District TIGER/Line Shapefiles - COMING SOON
2026 State Legislative District TIGER/Line GeoPackages - COMING SOON
State Legislative District Maps
The State Legislative District (SLD) Reference Maps display the boundaries, names, and/or codes of SLDs in effect for the 2026 election cycle. Two separate map types make up this series: one that displays State Legislative Districts – Upper Chamber (SLDUs) and one that displays the State Legislative Districts – Lower Chamber (SLDLs). Each of these maps show the extent of the subject SLD, as well as the surrounding SLDs of the same type.
Block Equivalency Files - COMING SOON
These Block Equivalency Files (BEFs) are the whole 2020 Census tabulation block representations of the 2026 State Legislative District plans as submitted by the states to the U.S. Census Bureau. Four states had changes to their state legislative districts since the 2024 elections. The .ZIP file contains a national block equivalency file and individual state files for just those two states that had changes to both their state legislative districts - upper chamber and lower chamber plans (Minnesota and Mississippi) and those two states with changes only to their state legislative districts - upper chamber plans (Alabama and Michigan) The fields in these files should be imported as text to preserve leading zeros.
In instances where plans included split 2020 Census tabulation blocks, the Census Bureau requested that the state assign the whole block to one district for the purpose of tabulating data. These block equivalency files contain the whole block tabulation plan. The Census Bureau's maps and TIGER/Line products depict the correct location of the boundary (splits tabulation blocks). A listing of those blocks split in the states' official plans is also provided.
Four states split blocks in their 2026 State Legislative District- Upper Chamber (SLDU) and State Legislative District- Lower Chamber (SLDL) plans: Colorado, Minnesota, North Dakota, and Washington. Additionally, Delaware split a block in their 2026 SLDU plan and Pennsylvania split a block in their 2026 SLDL plan.
Relationship Files
The 2026 State Legislative District Relationship Files provide simple relationships between 2026 State Legislative Districts and other 2020 Census tabulation geography including American Indian areas, counties, county subdivisions, census tracts, places, school districts, urban/rural population and land area, and ZIP Code Tabulation Areas.
