United States demographics:

• SimplyAnalytics (map-forward interface with business and consumer survey layers)
• PolicyMap (mapped data with policy layers)
• Social Explorer (mapped and tabular data with regional profiles)
• Passport GMID (retail and consumer data): Scroll over Countries and Consumers.
• Sage Data (government data in charts and tables): Select Subject > Population and Income.
• Historical Statistics of the U.S. (historical data from 1790-2000)
• U.S. Census Bureau
  • Explore Census Data (tables and maps)
  • Statistical Abstract of the U.S. (volumes published by year, 1878-2012; see ProQuest's Statistical Abstracts of the U.S. for the current edition)

International demographics:

• CEIC (extra detail for BRIC nations)
• International Data Base from the U.S. Census Bureau
• UNData
• World Development Indicators from The World Bank