Project Information

NHGIS Project Description

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 2000.

Release Schedule

Listed below are approximate release dates for new and revised datasets in NHGIS. Dates within the next year are more accurate than dates that are more than a year away. Please contact us (nhgis@pop.umn.edu) if you need an update on the status of any forthcoming mapping or statistical datasets.

Revision History

Please note there are two types of revisions that are documented. Revisions involving the NHGIS user interface and revisions that change the data (aggregate or mapping data) that can be retrieved from NHGIS. We will note the type of change in the summary.