Dataplace calls itself a 'one-stop-shop' for demographic and economic data about communities, regions and the US as a whole:
The site currently contains data from the 1990 and 2000 Censuses
(demographic, economic, housing, and social characteristics), Home
Mortgage Disclosure Act (home mortgage applications and loans), Section
8 Expiring Use database (neighborhood- and property-level data on
federally assisted housing at risk of loss), and Consolidated Plan
special tabulations (data on housing needs by household income level).
Simply type in any US city and do a search. The site comes with a mapping tool and a chart and table builder and provides statistical snapshots, area profiles, and news.