Historical U.S. County Boundaries (1629-2000)
Click the map to load county information.
Select state(s) and time
To begin, move the slider to select a year. To alter the map, choose particular states and a date below or change the style and opacity of the displayed counties. Choose the "info" tool and click on the map to learn more about each county. When you are finished, you can save your map in a variety of formats.
Questions? Please contact the Scholars' Lab.