The U.S. Census Bureau has a wealth of information about the demographics of the United States at U.S. Census Factfinder. Visitors to the U.S. Census website can find data about hundreds of demographic factors and trends, such as population density, marital status, age and even educational status.
U.S. Census Bureau
Jun 18, 2005 | Citizen Participation & Research - State Organizations, Economic Development - Regional Agencies/Organizations, News Organizations - Local & Regional Newspapers, News Organizations - National News Sources, Urban Planning/Real Estate/Ec. Dev. - General Sites