2010 Census and American Community Survey (ACS) profiles for census tracts, neighborhood tabulation areas (NTAs), and PUMAs (similar to Community Districts). You can also constuct your own geographic areas using census tracts.
This comprehensive guide to finding data on New York City was created by Prof. Frank Donnelly, Baruch's former geospatial librarian. The guide is being maintained now by Prof. Charles Terng, our data services librarian.