Additional data made available through the project includes SVG boundary files for every US state, Topologically Integrated Geographic Encoding and Referencing (Tiger)/Line 2003 vector map data, and the USGS GeoNames database.

No microdata from the 1890 census survive, but aggregate data for small areas, together with compatible cartographic boundary files, can be downloaded from the National Historical Geographic Information System.

We purchased the boundary files from Claritas Corporation http://www.claritas.com.

In addition, NHGIS has created cartographic boundary files compatible with every census, and over 50 million lines of metadata describing the collection.

Another is Atlas Draw, a $750 program for those who need to create their own boundary files from scratch.

Aggregate data for small areas, together with electronic boundary files, can be downloaded from the National Historical Geographic Information System.

The dataset is composed of three files: an administrative boundary file, an administrative areas file, and a metadata file.