CenStats is a collection of statistical resources offered by the U.S. Census Bureau. Topics include building permits, county business patterns, and demographic and economic data for states and counties.
Site provides links to key demographic statistics from various federal agencies including the Administration for Children & Families, Food & Nutrition Service, and the National Science Foundation, just to name a few.
The CyberCemetery is an archive of government websites that have ceased operation (usually websites of defunct government agencies and commissions that have issued a final report). This collection features a variety of topics indicative of the broad nature of government information, including census and demographic information.