Ancestry/Research Tools Specialized map and search tools useful for genealogy, historical research and present-day research AncestorSearchHistorical U.S. CountiesHistorical U.S. Counties Auto-CheckerListing of all Historical U.S. County Boundary Maps by State by YearPeopleSearchLast updated: April 16, 2025 Main Map Tools Counties| Cities| Civil Townships| ZIP Codes| Township and Range| Elevation| Historical U.S. Counties| Time Zones| Area Codes