Home | Atlas of Historical County Boundaries Project

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State Data

Select a state from the map to view all of the Atlas' content related to that state, including shapefiles, chronologies, and metadata.

If you are having trouble viewing the map or clicking on it, try the list of states page.

National Data

Click on the national map to see all of the Atlas' content related to the nation at one view. Like the state map above this content includes shapefiles, and metadata.

Boundary Animations

US Historical County Boundaries, 1629-2000 (0:30)
US Historical County Boundaries, 1629-2000 (3:00)
US Historical County Boundaries (1629-2000), with State/Territorial boundaries (1783-2000) (0:30)
US Historical County Boundaries (1629-2000), with State/Territorial boundaries (1783-2000) (3:00)
US Historical State & Territorial Boundaries, 1783-2000 (0:30)
US Historical State & Territorial Boundaries, 1783-2000 (3:00)