Most of the results shown in the community profiles are based on the 1990 Census of Population and Housing, Summary Tape File 3. Cincinnati neighborhoods are defined on the basis of census tract codes using the standard definitions maintained by the City Planning Commission. Projections for the years 1997, 2002, 2007 are from the US Department of Housing and Urban Development. Those projections were prepared for entire census tracts, whereas the 1990 Census made it possible to use only the portions of census tracts within the City. In the case of tracts that cross the City's boundary, the 1990 portion of the tract's population within the City was applied to the 1997, 2002, and 2007 projections.