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United States Historical Geography
Free interactive maps for 36 states—highlighting county creations and boundary changes year-by-year—are online at MapofUS.org, along with census maps, road maps, and maps from prior centuries.
Boundary and Name Changes
Because counties were often divided and their names and boundaries changed, you may need to determine previous boundaries and jurisdictions to locate your ancestors' records. A county history is the best source of information about a county's origin. Other sources that can help you determine the origin of a county are:
- Kane, Joseph Nathan. The American Counties: Origins of Names, Dates of Creation and Organization, Area, Population, Historical Data, and Published Sources. Fourth Edition. Metuchen, New Jersey: Scarecrow Press, 1983. (Family History Library book 973 E2ka 1983.)
- The Handy Book for Genealogists. Eighth Edition. Logan, Utah: Everton Publishers, 1991. (Family History Library book 973 D27e 1991.)