The Hill Library's weekly "Business Web Site of the Week" is City-Data.com.
"Enter a county, city, or zip code – or browse by state – to find pages and pages of information on U.S. places. Included are statistics on everything from age and income to ancestral heritage; from population change due to commuting to crime rates; from most common occupation to climate trends."
HOWEVER, it goes on to say, "The page just keeps scrolling, and the mind reels about where all this information comes from. Unfortunately, the site doesn’t make that clear. Because of this, please do attempt to verify any City Data you plan to use."