Geographic Resources

Lists and Geographic Codes

Bridge/Crosswalk Files

  • National Historical GIS Geographic Crosswalks (NHGIS): These crosswalks describe how U.S. census geographic units from one census year correspond to units from another year. 

  • Geocorr Geographic Correspondence Engine (Missouri Census Data Center): Generate your own crosswalk files for dozens of geographic layers, complete with the ability to weight by population, land area or housing units.

  • USPS ZIP Code Crosswalk Files (HUD): These crosswalk files, which link ZIP Codes to multiple different geographies—from census tracts to congressional districts—are updated quarterly.

  • ZIP Code Tabulation Area to County Bridge (StatsAmerica): ZIP Code Tabulation Areas (ZCTAs) were assigned to both Census and BEA counties based on population-weighted ZCTA centroids. This bridge is based on TIGER 2018 shapefiles from the U.S. Census Bureau, and the centroids were weighted based on Census 2010 block-level population.

Shapefiles for Mapping

Related Links