- Gapminder international economic, medical and social statistics
- UNICEF: international data about children and women
- International Database: 228 countries with 5,000 or more people from UDS.
- Census.gov United States Community Information
- Open Data Network U.S. Data organized by state and metro area.
- Statistical Abstract of the United States: historical census data 1889-2010
Opinions & Polls
- Pew Research Center
Polls on a wide variety of topics
- Gallop News (Public Opinion)
Current and historical polls on politics, the economy, and social issues around the world
- American National Election Studies (ANES)
High-quality data from its own surveys on voting, public opinion, and political participation