Greene and Harrington (1932). American Population Before the Federal Census of 1790. New York., as cited in: Rosenwaike, Ira (1972). Population History of New York City. Syracuse, N.Y.: Syracuse University Press. Lk 8. ISBN0-8156-2155-8.
"Population Density", Geographic Information Systems – GIS of Interest. Accessed 2007-05-17. "What I discovered is that out of the 3140 counties listed in the Census population data only 178 counties were calculated to have a population density over one person per acre. Not surprisingly, New York County (which contains Manhattan) had the highest population density with a calculated 104.218 persons per acre."
