Geography: Geospatial Data

Historical data, showing legislative districts from 1980 to 2006, is available in the Political Districts and Boundaries, 2006 and 2007 data set from the Infrastructure Data page of the Illinois Natural Resources Geospatial Data Clearinghouse.

This INHS site contains links to various INHS projects that have produced GIS data.

A collection of over 190 small-scale data sets from the online National Atlas of the United States (1997-2014).

The Census Bureau maintains a site with cartographic boundary files for various Census geographic divisions, including files for the entire country and individual states.

The National Historical Geographic Information System (NHGIS), at the University of Minnesota Data Center, provides historical Census data and GIS boundary files for the United States between 1790 and 2013. Data is provided free of charge to registered users.

This site from the Newberry Library in Chicago provides maps, text and GIS data about the creation and changes of the size, shape, and location of every county in the United States and the District of Columbia.

An index to over 2-million place names in the United States and U.S. Territories that appear on 7.5" topographic maps. It can be used to identify the name of the topographic map that covers a particular location.

GIS data for the state of Indiana.

A web site with links to various sites that have GIS data for the state of Iowa.

GIS data for the state of Missouri.

GIS Data from the Wisconsin Department of Natural Resources.