- Nationmaster: Facts and statistics about the countries of the world.
- Gapminder: Discover how countries change in health, environment, etc.
- Geohive: Geopolitical data, statistics on the human population, Earth and more.
- World Fact Book: Data from the Central Intelligence Agency.
- Info Please: Atlas, encylopedia, dictionary, countries, timelines.
- Centers for Disease Control: CDC health data
- US Census Bureau: Statistics on the United States.
- Factfinder: US Census Bureau data by zip code.
- Statemaster: Facts and statistics about the United States.
- EPA Community Search: Environmental issues by zip code.