BusinessDecision will help entrepreneurs identify where target customers live in order to find the best locations for their businesses. You will need to create an account.
City-Data.com - Statistics on U.S. cities: house prices, home value estimator, recent sales, maps, weather, per capital income.
Governing Sourcebook Data - Look at a state demographics on education, health, economy & finance, and environment.
Home Town Locator - Community Profiles of 42,500 US Cities, Towns, & Zip Codes
Melissa Data Lookup - Get information on zip codes, addresses, income, counties, demographics.
National Historical Geographic Information System (NHGIS)
America's Health Rankings - Ranks the 50 states from healthiest to least healthy and provides information on their strong and weak areas.
Population Reference Bureau - A one-stop source for U.S. population data covering education, income, labor, employment, mortality, estimates and projections, and more
Real Estate Journal: The Wall Street Journal Guide to Property - City profiles of major U.S. Cities
StateMaster - Research a large number of statistics by categories for U.S. states
State of the Cities Data Systems, Department of Housing & Urban Development
The Walter Cronkite School of Journalism and Mass Communication has produced lectures and demos about a variety of datasets produced by the Census Bureau and other Federal Agencies such as Census data, American Community Survey, Current Population Survey, Economic Census, Housing and Construction data, data from the Bureau of Economic Analysis, foreign trade statistics, and more.