You can download these by state or for the entire nation from the Gazetteer Files or the Cartographic Boundary Files .
Offers a comprehensive Geographic Boundaries dataset that includes state and county boundaries. Download State Line zip
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 You can download these by state or for
These are vector digital data files (shapefiles) compatible with most GIS software. 2. ZIP Code Boundaries ZIP Code Boundaries To download state lines and
To download state lines and ZIP code boundaries, the provides the official geographic data in compressed ZIP files containing shapefiles or Gazetteer files. 1. State Line Boundaries
Many states provide their own localized ZIP downloads for higher accuracy. For example: