Historical U.S. County Boundary Maps
- The Place box uses a standard Google Maps geocoding engine, therefore you can type present-day street addresses, road names, points of interest, and the like, and then type in an historical year to see what county that address or road was located in back then. Of course, this doesn't account for addresses or road names that may have changed, so if you suspect that, then just start with the right present-day town or city name.
- TIP: The information lists the full place name in the form of "Place, Historical County, State, USA". To save time, you can highlight this text and Copy (Ctrl+C) and Paste (Ctrl+V) it into your genealogy program's location field.
- Occasionally, county lines may take up to 10 seconds to appear; if the county lines never appear, try refreshing the page (F5) and try your search again.
- This tool uses an experimental Google Maps API feature called Fusion Table Layers. The underlying county boundary map files used are quite large, and Google Fusion Tables are themselves a beta product. As with any new and innovative technology, don't be surprised if things occasionally don't function as expected.
- County boundaries must be viewed one state at a time due to states having overlapping claims for the same area in some historical years. To aid in multi-state searches, when you drag the map such that it's center falls in another state, you will be asked if you wish to show county boundaries for that new state instead.
- The fantastic source of the historical county boundaries and related information used in this tool is the Atlas of Historical County Boundaries, a project of The Dr. William M. Scholl Center for American History and Culture at The Newberry Library in Chicago, Illinois. The information is included in this tool under the Creative Commons license shown on the bottom of the linked page.
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