U.S. Congressional District Boundaries for the 119th Congress
Updated 4mo ago
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Description
United States Congressional Districts for the 119th Congress, seated from January 3, 2025, to January 3, 2027, with boundaries reflecting information provided to the Census Bureau by May 31, 2024. The dataset includes 435 voting districts and 9 non-voting delegate or commissioner districts, with attributes updated weekly from the House of Representatives.
Use Cases
Map congressional district boundaries and analyze geographic coverage, including areas assigned the 'ZZ' code for undefined districts in Connecticut, Illinois, and New Hampshire.
Append member of Congress information to district shapes using data sourced from the Clerk of the House's XML file for legislative analysis.
Study the spatial distribution of the 435 voting districts and the 9 non-voting at-large delegate and resident commissioner districts for political geography research.
Integrate district polygons with the National Transportation Atlas Database (NTAD) for infrastructure planning and analysis within administrative boundaries.
Strengths
Boundaries are updated every Sunday from the United States House of Representatives, ensuring regular attribute updates.
The dataset reflects the official 119th Congress boundaries effective from January 3, 2025, providing current political geography.
Based on the Census Bureau's MAF/TIGER Database, designed as a seamless national file with no overlaps or gaps between parts.
Limitations
The dataset does not cover all state area uniformly, as codes like 'ZZ' are used for undefined congressional districts in three states.
Non-voting delegate districts for territories are represented as single records, limiting granular analysis for those areas.
Boundary information is static after the May 31, 2024, submission deadline and does not reflect subsequent local changes.
Provenance
Source
United States Census Bureau (USCB) TIGER/Line files and United States House of Representatives (Office of the Clerk).
Collection Method
Extracted from the Census MAF/TIGER Database; member attributes appended from the Clerk's XML file.
Time Range
Effective from January 3, 2025, to January 3, 2027.
Freshness
Attributes updated every Sunday; boundaries current for the 119th Congress (2025-2027).
Geography
United States, including states, District of Columbia, Puerto Rico, and U.S. Island Areas.
Requires GIS software to utilize the polygon shapefile format; a data dictionary is required for attribute details and is accessible via a provided DOI link.