For relating ZIP codes to other geographies (like counties or states), the HUD-USPS ZIP Code Crosswalk API allows you to download crosswalk data for specific states or for all states in a specific quarter. 3. State-Specific Reports & GIS Data
Offers a comprehensive Geographic Boundaries dataset that includes state and county boundaries.
Select the year and the geographic layer (e.g., "States" or "ZIP Code Tabulation Areas") to generate a download link. Census Bureau Data Download State Line zip
The Census Bureau uses , which are generalized representations of USPS ZIP code service areas.
These are vector digital data files (shapefiles) compatible with most GIS software. 2. ZIP Code Boundaries For relating ZIP codes to other geographies (like
This is the primary portal for searching and downloading tables in ZIP, Excel, or CSV formats.
You can download these by state or for the entire nation from the Gazetteer Files or the Cartographic Boundary Files . Select the year and the geographic layer (e
Many states provide their own localized ZIP downloads for higher accuracy. For example: