Social Explorer provides demographic information and modern and historical census data (1790 to 2000) as data maps. The site has created hundreds of interactive data maps of the United States. US Census data includes all annual updates from the American Community Survey to 2008, original Census tract-level estimates for 2006 and 2010, the Religious Congregations and Membership Study from 1980 to 2000, and 2002 Carbon Emissions Data from the Vulcan Project.