Census records and name lists for New York are found mostly at the county level, which is why this work shows precisely which census records or census substitutes exist for each of New York's sixty-two counties and where they can be found. In addition to the numerous statewide official censuses taken by New York, this work contains references to census substitutes and name lists for time periods in which the state did not take an official census. It also shows the location of copies of federal census records and provides county boundary maps and numerous state census facsimiles and extraction forms.

Genealogical research in U.S. censuses begins with identifying correct county jurisdictions ??o assist in this identification, the map Guide 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 ten-year intervals. Accompanying each map are explanations of boundary changes, notes about the census, & tocality finding keys. In addition, there are inset maps which clarify ??erritorial lines, a state-by-state bibliography of sources, & an appendix outlining pitfalls in mapping county boundaries. Finally, there is an index which lists all present day counties, plus nearly all defunct counties or counties later renamed-the most complete list of American counties ever published.