17 October 2025
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Atlas of Historical County Boundaries
From the Newberry Library, Chicago, Illinois. Includes for each state: Interactive Map; Index of County and Equivalents; Consolidated Chronology; Individual County Chronologies; Bibliography and Sources; Historical Commentary; Metadata - Summary Form; Metadata - Full FGDC Form; Download GIS Files; Download KMZ Files; Download PDF Files.
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A project of the William M. Scholl Center for American History and Culture at The Newberry Library in Chicago, the Atlas of Historical County Boundaries is a powerful historical research and reference tool in electronic form. The Atlas presents in maps and text complete data about the creation and all subsequent changes (dated to the day) in the size, shape, and location of every county in the fifty United States and the District of Columbia. It also includes non-county areas, unsuccessful authorizations for new counties, changes in county names and organization, and the temporary attachments of non-county areas and unorganized counties to fully functioning counties. The principal sources for these data are the most authoritative available: the session laws of the colonies, territories, and states that created and changed the counties.
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