Research Tools: Atlas of Historical County Boundaries

URL:

http://publications.newberry.org/ahcbp/

Resource Types:

Data

Description:

"Presents in maps and text complete data about the creation and all subsequent changes (dated to the day) in the size, shape, and location of every county in the fifty United States and the District of Columbia." Available as interactive maps and shapefiles that can be downloaded for use with GIS software.