2024 U.S. Congressional District Cartographic Boundaries

United States cartographic boundary files provide simplified representations of the 435 congressional districts for the 119th Congress, seated from January 2025 to December 2026. The U.S. Census Bureau created these shapefiles from the MAF/TIGER Database, specifically designed for small-scale thematic mapping. Boundaries are based on state-provided information as of May 31, 2024.

Use Cases

• Create thematic maps of U.S. congressional districts for the 119th Congress using the generalized boundary shapefiles.
• Analyze the spatial distribution and contiguity of the 435 congressional districts across states.
• Identify areas assigned the 'ZZ' code in Connecticut, Illinois, and New Hampshire where no congressional district was formally defined.
• Visualize the single non-voting delegate districts for the District of Columbia, Puerto Rico, and U.S. Island Areas.

Strengths

• Represents the official 435 U.S. congressional districts for the 119th Congress.
• Boundaries are based on state-provided information finalized by May 31, 2024.
• Specifically designed for small-scale cartographic presentation, ensuring visual clarity.

Limitations

• Geographic boundaries are simplified generalizations and may not align with exact legal or administrative lines.
• Boundaries for a given year may not align with the same areas from another year, complicating temporal analysis.
• In Connecticut, Illinois, and New Hampshire, some state areas are not covered by a defined district, represented by a placeholder 'ZZ' code.

Provenance

Source

U.S. Census Bureau, Department of Commerce

Collection Method

Simplified from the Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database.

Time Range

Boundaries are for the 119th Congress, seated from January 2025 through December 2026.

Freshness

Data reflects boundaries for the 119th Congress (2025-2026) and was last updated on the platform in August 2025.

Geography

United States, including the 50 states, District of Columbia, Puerto Rico, and U.S. Island Areas (American Samoa, Guam, Northern Mariana Islands, U.S. Virgin Islands).