This data page provides information and links to GIS data that is historical in nature. For instance, there are links to historical county boundaries from the Smith Center in the Newberry Library or downloadable GIS data from the NHGIS.
The International Historical Geographic Information System (IHGIS) provides data tables from population and housing censuses as well as agricultural censuses from around the world, along with corresponding GIS boundary files. Data from diverse published documents are provided in a standardized, ready-to-use structure with thorough, consistently formatted metadata. ...
IHGIS provides shapefiles to describe the boundaries of administrative and statistical units represented in IHGIS data files. By linking the data tables to the boundary files, you can map the characteristics in the data tables. The GISJOIN field present in both the shapefiles and the data files serves as the link between the files. You can perform a join in a GIS package to attach columns from a data file to the attribute table of the boundary shapefile. ...
The National Historical Geographic Information System (NHGIS) is a project to create and freely disseminate a database incorporating all available aggregate census information for the United States between 1790 and 2000. STILL UNDER CONSTRUCTION!
*Collect and enrich historical and contemporary U.S. Census summary data.
* Incorporate these data into a Geographic Information Systems framework.
*Create a web-based system for access to both census data and the metadata.
This site provides digital boundary definitions for every U.S. Congressional District in use between 1789 and 2012. These were produced as part of NSF grant SBE-SES-0241647 between 2009 and 2013.
The current release of these data is experimental.