Due to the current government shutdown, most of the federal data sites, including those from the Census Bureau and the Bureau of Economic Analysis are closed. Some alternative ways of obtaining U.S. data include the following:
Statistical Insight Indexes statistics in federal, state, and international documents. Approximately 15% of federal statistical publications are available in full text.
Social Explorer The database includes the entire US Decennial Census history from 1790 to 2010, all annual updates from the American Community Survey, the Religious Congregations and Membership Study from 1980 to 2000, and selected election and carbon emissions data.
Internet Archive Wayback Machine Should help provide access to many government data and information resources currently unavailable via traditional means. Please keep in mind that the information on the Archive will not be updated during the shutdown.
World Development Indicators Produced by the World Bank, this database contains demographic and economic statistical information for the countries of the world, including the U.S.