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provides "indexes of racial residential segregation for all states, for all counties, for all metropolitan areas and for all cities of 100,000 or more using information from the Census of 2000. Indexes of dissimilarity, exposure indexes and interracial contact measures are available for five single races and for the three most frequently reported combinations of two races."
Measuring America: The Decennial Censuses from 1790 to 2000
provides "a Longitudinal Tract Data Base (LTDB), which provides public-use tools to create estimates within 2010 tract boundaries for any tract-level data (from the census or other sources) that are available for prior years as early as 1970."