The online Atlas of Historical County Boundaries is a go-to resource for determining old U.S. county boundaries.
The atlas of historical county boundaries
How to find county boundaries with the Atlas of Historical County Boundaries in three steps
1. From the Atlas home page, click on the state of interest from the national interactive map.
2. From the state page, click on View Index of Counties and Equivalents. This will show you all current and past county names.
3. From this page, click on your targeted county. You’ll find a timeline of that county’s boundary changes.
Use the timeline to discover what county your ancestors belonged to at any given time. Perhaps you’ll discover you should actually be looking for an ancestor’s marriage record or probate in a parent county, one that existed there before the current county, or in a successor county later carved out of this one.
Google Earth Bonus: The Atlas of Historical Boundary Changes state pages include downloadable maps compatible with Google Earth and Google Maps. If you are not using Google Earth for genealogy yet, watch Lisa Louise Cooke’s free video to see how and why you want to use this amazing 3D map of the world for your family history! You can learn more about downloading the Atlas of Historical County Boundaries files to Google Earth in Lisa’s book The Genealogist’s Google Toolbox.
Learn More about Using Interactive Maps for Genealogy
This surprise discovery of a WWI German ancestor on a free website can inspire your own family history research discoveries. Bonus: watch a free video on how to find your German ancestor’s home village! Following Our German Expert’s Advice Not long ago, I made a...
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The Beaver Map, 1715. By Special Collections Toronto Public Library. Flickr, via Wikimedia Commons.
Recently I’ve seen two calls for volunteers to help “georeference” old maps. Basically, you’re tagging the maps in a way similar to tagging photos of people on social media sites. This makes finding old maps online easier and more accurate. It also allows sites to overlay the old and new maps. “Some places have changed significantly or disappeared completely, creating a puzzle that reveals an exciting contrast,” explains the British Library.
These two sites are asking for volunteers:
The British Library Online Gallery.The British Library is asking for volunteers to help georeference 50,000 maps it’s put online. Go right to the site and you’ll see the invitation to help on the home page. You’ll also see that you can click on a tab to search maps that are already georeferenced! The British Library tells its volunteers: “Your name will be credited, and your efforts will significantly improve public access to these collections. Contributors can see the results of their work, as well as the progress of the pilot and other participants, and the top contributor will be publicly announced.”
David Rumsey Historical Maps. This mega-maps site is also looking for volunteers to help add locations to its online map collections. On the home page, click on the left where it says Georeferencer: Help Add Location to Maps.
We blog about maps a lot here at Genealogy Gems. To learn more about using old maps online and for genealogy, go to our home page and search on the Maps category on the lower left side of the page. Additionally, Genealogy Gems Premium members have access to full-length video classes like these:
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