Geographic Resources

Lists and Geographic Codes

Census Bureau Code Lists: A variety of FIPS codes are available for download, including counties, places and townships, among others.
BEA County FIPS Codes: A comprehensive list of the county definitions and modifications used by the U.S. Bureau of Economic Analysis.
Metropolitan and Micropolitan Delineation Files (Census Bureau): Includes current and historical definitions for core-based statistical areas, metropolitan divisions and combined statistical areas.
Economic Development Districts (EDDs) as of January 2023 (StatsAmerica): These federally recognized EDDs are designated by the U.S. Economic Development Administration.

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.

TIGER/Line Shapefiles (Census Bureau): These files cover numerous geographies at the national, statewide and county levels.
TIGERweb: This interactive web map is a simple way to view TIGER/Line data without having to download it.
Cartographic Boundary Files (Census Bureau): Simplified representations of selected TIGER data for use in small-scale thematic mapping.
The National Map (U.S. Geological Survey)
Geospatial Data Gateway: Environmental and natural resources data
National Historical Geographic Information System: Provides free census data and boundary files for the U.S. dating back to 1790.
Atlas of Historical County Boundaries: Complete documentation of all county-level boundary changes in all 50 states dating back to the 1600s.
U.S. Congressional District Shapefiles (UCLA): Historical boundaries for every U.S. congressional district between 1789 and 2012.