Technical Assistance


If you are having difficulties with the NHGIS extract system, 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


Improvement of the tabular data, boundary files, and documentation depends, in part, on feedback from users who share their suggestions and observations about errors, inconsistencies, and lack of clarity in the data and documentation. We ask users to notify us about any errors or problems they encounter or to make suggestions about how the materials could be improved.

Please send feedback 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

Minnesota Population Center
University of Minnesota
50 Willey Hall
225 19th Ave S
Minneapolis, MN 55455

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