NHGIS
National Historical Geographic Information System

Welcome to NHGIS

The National Historical Geographic Information System (NHGIS) provides, free of charge, aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2013.

***Scheduled Downtime***
The NHGIS site will be temporarily unavailable during maintenance operations on Saturday, May 23, between 2 and 3 pm CDT