Census Data Mapper – Beta
http://www.census.gov/geo/maps-data/maps/datamapper.html

The Census Data Mapper is a web mapping application intended to provide users with a simple interface to view, save and print county-based demographic maps of the United States. The data are from the 2010 Census. This will be added to the tools section of Research Resources Subject Tracer™ Information Blog. This will be added to Statistics Resources and Big Data Subject Tracer™. This will be added to Internet Demographics Subject Tracer™.