Contact Information


If you're having difficulties with the NHGIS website, data, or documentation, please email the User Support team for assistance. Please be as detailed as possible in your email so we can better address the problem.

Please send assistance requests to


We welcome suggestions and observations, praise or criticism, about any NHGIS features, data, or documentation. If you discover a significant error, we will happily send you a complimentary IPUMS NHGIS mug.

Please send feedback to


If you have questions about acceptable use of NHGIS data or about NHGIS sources, methods, features, or plans, please send your questions to


NHGIS periodically adds new data and occasionally makes revisions or improvements to existing data and the website itself. While the Release Log lists these changes, we recommend following us on Twitter for prompt updates on the latest NHGIS data releases.

Mailing address

Institute for Social Research and Data Innovation
University of Minnesota
50 Willey Hall
225 19th Ave S
Minneapolis, MN 55455

Phone & Fax

Phone: 612-624-5818
Fax: 612-626-8375