Statistical Abstract of the United States
Start with the online Statistical Abstract of the United States an annual summary publication by the U.S. Census Bureau of statistics covering the social, political, and economic organization of the United States. Contains over 1000 tables organized according to subject (e.g., Agriculture, Education, Transportation). Within each table, see the "source note" provided at the bottom for more information on where to continue your search. Some data is available back to 1878. As of 2011, this data is no longer updated.