If you are planning to use your own software to develop a redistricting plan, please use the following census data provided by the U.S. Census Bureau.
The geographic data is in the shapefile format. Please see the TIGER shapefiles documentation for more information. The files are compressed for your convenience.
These are the 2010 TIGER shapefiles geography provided by the U.S. Census Bureau. To reduce download times shapefiles for each county are a separate download. The statewide shapefiles (only includes statewide features) are also a separate download. Please see the 2010 TIGER shapefiles documentation for more information on the data within these files.