US Census Bureau:Includes data for the 2000 Census of Population and Housing, the U.S. and World Population clocks.
CenStats Databases: Census maps, building permit statistics, county business patterns, and other databases from the Census Bureau.
Census 2000 Data Access and Use: Supplementary data about the data which augments the information on Census 2000 provided by the Census Bureau. Includes news, perspecitives, documents, spreadsheets.
Census 2000 Resident Population and Apportionment Counts: Provides access to the first results of the 2000 Census, including video clips, historical photographs, and school materials.
How Stuff Works: U.S. Census: The story behind the $6.5 billion U.S. Census and why the paperwork is required. Explains what the government actually does with the census forms and how the actual census operates; links to relevant information.
Infoplease.com: Historical perspective and statistics of the U.S. Census
Missouri Census Data Center (MCDC): Provides menu-driven access to 1980, 1990, and 2000 Census Demographic Profiles for all states, counties, tracts, cities, ZIP codes and metropolitan areas for entire United States.
POP Clocks: World and United States population counters.
State & County QuickFacts: Provides frequently requested Census Bureau information at the national, state and county level.
Statistical Abstract of the United States: Statistics on social and economic conditions in the United States. Selected international data included.
Statistics About Business Size: Statistics about small business or company size in general, available from the U.S. Census Bureau data.
U.S. Census Bureau People Topics: Historical, current, and estimated population statistics searchable by a variety of topics. Includes running US and World PopClocks.
US Census Bureau, Census 2000: General information on Census 2000. Includes access to data from the 1990 census.