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The Census Bureau's API allows developers to design web and mobile apps to explore or learn more about America's changing population and economy.
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Population Estimates and Projections

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Population Estimates and Projections

Population Estimates Program

  • Population Estimates APIs
    December 21, 2021
    Population estimates datasets currently available via API.

Population Projections

  • Population Projections APIs
    February 20, 2020
    Population projection datasets currently available via API.

How are estimates different from projections?

While projections and estimates may appear similar, there are some distinct differences between the two measures. Estimates are for the past and present, while projections are based on assumptions about future demographic trends. Data users may find both an estimate and a projection available for the same date (e.g., July 2015), which may not agree. In such cases, estimates are the preferred data, unless the user's objective is to compare the number with others in the projected series.

International Database

  • International Database (Time Series: various year - 2100)
    August 08, 2023
    The International Database (IDB) offers a variety of demographic indicators for countries and areas of the world with a population of 5,000 or more.

Related Information

  • Developers' Forum
    Need help? Check out our Developer Forum to submit questions, share your apps, and provide feedback.
  • FTP Server
    To download full datasets, visit our FTP Server.
  • Population and Housing Unit Estimates
    Produces estimates of the population for the United States, its states, counties, cities, and towns, as well as for the Commonwealth of Puerto Rico.
  • Population Projections
    Population projections are estimates of the population for future dates.
  • International
    The U.S. Census Bureau conducts demographic, economic, and geographic studies of other countries and strengthens statistical development around the world.
Page Last Revised - December 18, 2023
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