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The county has always been used as the basic Federal census unit. Genealogical research in the census, therefore, begins with identifying the correct county jurisdictions. This work shows all U.S. county boundaries from 1790 to 1920. On each of the nearly 400 maps the old county lines are superimposed over the modern ones to highlight the boundary changes at tenyear intervals. Also included are (1) a history of census growth; (2) the technical facts about each census; (3) a discussion of census accuracy; (4) an essay on available sources for each state's old county lines; and (5) a statement with each map indicating which county census lines exist and which are lost. Then there is an index listing all presentday counties, plus nearly all defunct counties or counties later renamed. With each map there is data on boundary changes, notes about the census, and locality finding keys. There also are inset maps that clarify territorial lines, a statebystate bibliography of sources, and an appendix outlining pitfalls in mapping county boundaries. The detail in this work is exhaustive and of such impeccable standards that there is little wonder why this awardwinning publication is the number one tool in U.S. census research.
⚠️ WARNING (California Proposition 65):
This product may contain chemicals known to the State of California to cause cancer,
birth defects, or other reproductive harm.
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