Use them to find smaller data subsets on almost any topic. You'll find official statistical data for 1,078 U.S. cities and all 3,141 counties as well as 11,097 places of 2,500 or more inhabitants. The home page looks daunting at first, but begin entering your choices and you'll soon learn how to create all the data combinations you want. In PDF format. Government Information Sharing Project Compiles demographic, economic and governmental information covering several years and sources for city, county comparisons and profiles.
Instructions are very clear.
Louis Can search for state, county, metropolitan area, place, tract, block span, zip code by its geographic code. Can look up the codes by scrolling to bottom of the home page.