8 geographies covering over 350,000 locations

Census 2000 in 2010 Boundaries gives you access to over 3,500 demographic variables at the Block Group level and above and an additional 10,000 for tract level and above.
These geograhic areas consist of the following levels (numbers indicate how many specific areas are within that geographic level):

		United States (1)
		States (51)
		Congressional District (423)
		Counties (3,143)
		Census Designated Places (29,261)
		Zip Codes (ZCTA) (33,092)
		Census Tracts (73,057)
		Block Groups (217,740)