In my last posting I described income differences in 800 upstate metropolitan neighborhoods in Albany, Erie, Monroe, Oneida, Onondaga, Rensselaer and Schenectady Counties. The data comes from the United States Census Bureau which divides the nation into census tracts, the most detailed level publically tabulated. Overall, there are 73,000 census tracts nationally, averaging 4,200 residents each. […]