ZIP to 120th Congressional District Crosswalk
Match U.S. ZIP codes to districts for the 120th Congress with transparent allocation weights, source methods, result types, and quality flags.
Home / Data Tools / ZIP to 120th Congressional District
What is included
- 46,609 ZIP-to-district records covering 39,165 ZIP codes across all 50 states and the District of Columbia.
- A primary crosswalk table and a state-level quality summary.
- Weights for ZIP codes that intersect more than one congressional district.
- Source fields, allocation methods, result types, and quality flags for review and reproducibility.
Workbook columns
| Column | Description |
|---|---|
zip | Five-digit USPS ZIP code. |
state | USPS preferred state. |
city | USPS preferred city. |
cd120 | Congressional district for the 120th Congress. |
crosswalk_weight | Allocation weight for the ZIP-district record. |
source_ratio_field | HUD ratio field used to construct the weight. |
source_file | Source crosswalk file. |
result_scope | Address population represented by the result. |
allocation_method | Method used to assign or allocate the ZIP to the district. |
uses_residential_model | Whether the residential allocation model was used. |
final_result_type | Direct, residential, or fallback result classification. |
quality_flag | Record-level quality indicator. |
Method
The workbook uses the June 2026 HUD-USPS crosswalk release. Direct HUD ZIP-to-congressional-district results are retained where applicable. For states with new district boundaries, ZIP-to-tract residential ratios and 120th Congress block relationships support the allocation. Records that require a lower-quality fallback are identified rather than silently combined with standard results.
ZIP codes are delivery routes, not Census geographies. A ZIP may intersect multiple congressional districts,
so the file can contain more than one record for a ZIP. Use crosswalk_weight when allocating ZIP-level
counts across districts.
Purchase and licensing
The $299 purchase includes one downloadable Excel workbook for the buyer's internal use. Redistribution, resale, sublicensing, publication of the full dataset, or inclusion in a commercial data product is not included. Contact FastHSR to negotiate a commercial or resale license.
By purchasing, you agree to the FastHSR Terms of Use. Data is provided as-is and should be reviewed for fitness for the buyer's intended application.