Historical Atlases and Maps of U.S. and States has online county formation maps for all the United States. Choose you state of interest and scroll down on the individual state page to see it.Historical Atlases and Maps of U.S. and States has online county formation maps for all the United States. Choose you state of interest and scroll down on the individual state page to see it.
I find this tool useful for finding historical county boundaries as of a given date
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