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, April 25, from 4 pm until possibly 12 am CDT