- University of North Carolina: World Population Clock
 - Java-based population clock showing the current population of the Earth. Compare today's numbers to real and estimated population statistics from 1970 through 2037. - U.S. Census Bureau: World POPClock Projection
- See estimates of the current world population from the U.S. Census Bureau. Includes daily and monthly figures based on population, fertility, mortality, and migration data.
- Princeton University: World Population Clock
- Constantly updated clock showing the current estimated population of the Earth. Synchronized with the World Population Clock at the U.S. Census Bureau. From the Princeton University Office of Population Research.
- Konfabulator: World Population Clock
- Get a desktop widget showing up-to-the-minute updates of the world population. Based on population data from the U.S. Census Bureau. From Konfabulator.
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