Congressional Districts
Congressional Districts
The tabs below represent the unique congressional sessions as collected by the U.S. Census Bureau through the Redistricting Data Program. Each tab contains information specific to that session's boundary collection along with other relevant products generated in support of any changes. Typically, new products are generated only when changes to congressional districts are reported between sessions. Any changes to congressional 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.
Congressional districts are generally included as part of the standard set of geographies for which decennial census and American Community Survey (ACS) 1-Year and 5-Year estimates data are produced. These data are available on data.census.gov. 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.
120th Congress
Following the post-2020 Census redistricting process, the Census Bureau collects congressional district boundaries from all states for each new Congress. The information on this page reflects the boundaries as submitted by the state assigned nonpartisan liaisons in Phase 4 of the Redistricting Data Program, i.e. those in effect for the 2026 election cycle.* Ten states (Alabama, California, Florida, Louisiana, Missouri*, North Carolina, Ohio, Tennessee, Texas, and Utah) delineated new boundaries for the 2026 election cycle. All other states, the District of Columbia, and Puerto Rico had no changes to their congressional district boundaries from the 2024 cycle.
*IMPORTANT NOTE: On September 3, 2026, the Missouri Supreme Court ruled that the state's congressional district plan redrawn for the 2026 elections cannot be used, and instead a referendum on whether the state can use the plan must be included on the November 2026 ballot. This decision was made after the 120th Congressional District plans were collected by the U.S. Census Bureau and geographic and data products were generated. Therefore, the 120th Congressional District products produced to date by the U.S. Census Bureau reflect the Congressional District plan that was created under House Bill 1 of the 103rd General Assembly’s 2nd Extraordinary Session and signed by the Governor in September 2005 and may not reflect the districts that will be in place for the November 2026 elections.
Data Products
2020 Census 120th Congressional District Summary File - Release planned for December 2026
The 120th Congressional District Summary File (CD120) contains data for congressional and state legislative 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 1-Year and 5-Year Estimates Data
1-Year and 5-Year Standard Data Release
The ACS produces data for congressional districts (CDs) annually, as part of the standard 1-year and 5-year estimates data releases. ACS data for the 120th Congressional Districts will be released at a later date as part of the standard ACS data releases. These data will be available at data.census.gov. Currently data for the 119th Congressional Districts are available as part of the standard release.
Geographic Products
TIGER/Line Shapefiles, Geodatabases, and GeoPackages
TIGER/Line products include the 120th Congressional Districts, the 2026 State Legislative 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.*
If the boundary of a congressional or state legislative district splits 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 will be 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 geopackages and shapefiles.
*IMPORTANT NOTE: On September 3, 2026, the Missouri Supreme Court ruled that the state's congressional district plan redrawn for the 2026 elections cannot be used, and instead a referendum on whether the state can use the plan must be included on the November 2026 ballot. This decision was made after the 120th Congressional District plans were collected by the U.S. Census Bureau and geographic and data products were generated. Therefore, the 120th Congressional District products produced to date by the U.S. Census Bureau reflect the Congressional District plan that was created under House Bill 1 of the 103rd General Assembly’s 2nd Extraordinary Session and signed by the Governor in September 2005 and may not reflect the districts that will be in place for the November 2026 elections.
120th Congressional Distict (2026) Tiger/Line Shapefiles - Release planned for September 2026
Block Equivalency Files
These Block Equivalency Files (BEFs) are the whole 2020 Census tabulation block representations of the 120th Congressional District plans as submitted by the states to the U.S. Census Bureau.* The .ZIP file contains a national block equivalency file and individual state files for the ten states (Alabama, California, Florida, Louisiana, Missouri*, North Carolina, Ohio, Tennessee, Texas, and Utah) that redrew their congressional district plans for the 120th Congress. 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 shapefiles will depict the correct location of the boundary (splits tabulation blocks). A listing of those blocks split in the states' official plans is also provided.
Only one state--Colorado--split blocks in their 120th Congressional District plan. Colorado split one block, 080010096072000, between Congressional District 07 and Congressional District 08. The data for that census block will be tabulated to Congressional District 08. This is unchanged from Colorado's 118th and 119th Congressional District plan.
*IMPORTANT NOTE: On September 3, 2026, the Missouri Supreme Court ruled that the state's congressional district plan redrawn for the 2026 elections cannot be used, and instead a referendum on whether the state can use the plan must be included on the November 2026 ballot. This decision was made after the 120th Congressional District plans were collected by the U.S. Census Bureau and geographic and data products were generated. Therefore, the 120th Congressional District products produced to date by the U.S. Census Bureau reflect the Congressional District plan that was created under House Bill 1 of the 103rd General Assembly’s 2nd Extraordinary Session and signed by the Governor in September 2005 and may not reflect the districts that will be in place for the November 2026 elections.
Congressional District Maps
The congressional district map suite includes three map types (national, state-based, and congressional district-based) that depict the congressional districts in effect for the 120th Congress of the United States (January 2027-2029).
Congressional District Relationship Files
The 120th Congressional District Relationship Files provide simple relationships between the 120th Congressional 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.
