Several companies and organizations provide the world's population in real-time online, including the United States Census Bureau and Worldometers. As of 2015, the U.S. population is more than 320,000,000 and the world population is more than 7,257,000,000, according to the U.S. Census Bureau's population clocks.
The U.S. Census Bureau bases its projections on the organization's International Data Base. Visitors can view the 10 most populous countries and learn how often the population changes in the U.S.
Worldometers provides a running total of the world's population. The site also shows the number of births and deaths for the current day and year. Visitors can view how the world's population has grown over time, and milestones such as when the population reached one million.