01/28/2026
One of the biggest surprises in genealogy is discovering that your ancestors didn’t change towns, the boundaries did. That’s where the Atlas of Historical County Boundaries becomes a genealogy game changer.
This free resource from the Newberry Library lets you explore how county lines shifted over time across the United States, from the early 1600s through 2000. It shows when and how counties were created, split, renamed, or absorbed, which can make all the difference in knowing where your ancestor’s records might be found.
https://publications.newberry.org/ahcb/