Historical Statistics includes statistics about the United States from the colonial times up to the start of the 21st century. It provides U.S. population, economic, employment, governance and international relations data. You can even create and save custom tables.
Data from 2010 & 2000 census. Census Bureau's main interface for retrieving demographic and economic data from the American Community Survey, Decennial Census, Economic Census (every 5 years), and their Population Estimates.