U.S. Census records as far back as 1790 are available at Census.gov. Users can contact the U.S. Census Bureau if they need copies of printed reports.
U.S. Census reports are broken down by year and category. As of 2015, the reports available online range from the year 1790 to the 2010 census. The U.S. Census Bureau reports that the books were not optimized for online use, and therefore some may have broken links and missing pages. Because the reports are so large, the U.S. Census Bureau breaks them down by volume and makes them available for download in ZIP files.