The Atlas of Historical County Boundaries

The Atlas of Historical County Boundaries shows you the current boundaries of each county in the U.S., and it explains how each county’s boundaries changed over time.   I added the Atlas to the Counties entry, along with a few links to Census Bureau data that I discovered when I was updating the Census Bureau Information entry.

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About zimmermansguide

zimmermansguide is the WordPress username for Andy Zimmerman, the author of Zimmerman's Research Guide. Over the years people have asked me for a way to follow the changes to the Guide. The ZRG Blog is written for anyone who would really like to know.
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