The official state boundary lines are available through the TIGER/Line Shapefiles .
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 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 The official state boundary lines are available through
You can download these by state or for the entire nation from the Gazetteer Files or the Cartographic Boundary Files . Download State Line zip
These are vector digital data files (shapefiles) compatible with most GIS software. 2. ZIP Code Boundaries