Making research easier by incorporating publicly available map data into Google Maps-based tools

Map Tools

The main interactive map tools, organized by primary topic. These maps can be customized using the mapBuilder tool found below each map.

Ancestry / Research Tools

Specialized map and search tools useful for genealogy, historical research and present-day research


See counties as they were in every historic year since each state’s inception, overlaid on a present-day interactive map

Historical U.S. County Maps by State by Year

Get access to Ad-Free Fullscreen Map & Search tools

Plus, get access to mapBuilder and much more!

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Draw & measure on maps

Save maps to your account

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