Co-authored by Virginia D. Harrington. 2nd printing, 1997. Prepared under the auspices of the Columbia University Council for Research in the Social Sciences.

Genealogical research in U.S. censuses begins with identifying correct county jurisdictions ??o assist in this identification, the map Guide shows all U.S. coun

Report provides the total population for each of the nation's 3,141 counties from 1990 back to the first census in which the county appeared.