The nationwide state boundary file for 2025 is available as tl_2025_us_state.zip .
You can download these by state or for the entire nation from the Gazetteer Files or the Cartographic Boundary Files . 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 nationwide state boundary file for 2025 is
Select the year and the geographic layer (e.g., "States" or "ZIP Code Tabulation Areas") to generate a download link. Census Bureau Data 1. State Line Boundaries
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