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International Database: World Population Estimates and Projections

Why Does the U.S. Census Bureau Estimate the World’s Population?

The Census Bureau is the U.S. government’s source of population estimates and projections (E&Ps) for over 200 countries and areas of the world to the year 2100. We have produced these data since the 1960s, and we have published our results in the International Database (IDB) since 1996.

These data are provided freely online to inform U.S. government programs and as an educational resource. The IDB is widely used in K-12 and higher education, for research, in journalism, and by businesses.


Our population estimates and projections are informed by hundreds of data sources around the world, including censuses, surveys, administrative records, and vital statistics. National statistical offices of other countries are one of our primary resources. We use these data sources and population evaluation techniques to produce cohort-component population projections.

Our estimates and projections also incorporate major demographic shifts from events such as disease, conflict, disasters, and other complex humanitarian crises.

We implement our projections using the Demographic Analysis and Population Projection System (DAPPS).

Learn more about our tools and methods.

U.S. Island Areas

The International Database is the primary U.S. government source of population estimates and projections for the U.S. Island Areas of American Samoa, Guam, the Northern Mariana Islands, and the U.S. Virgin Islands. We also produce population projections for Puerto Rico.

Learn more about our estimates and projections for the U.S. Island Areas.

Available Data

The IDB includes demographic measures of over 200 countries and areas of the world with populations of 5,000 or more. Data in the IDB include total population, population by age and sex, and demographic characteristics such as fertility, mortality, and migration. Population size (by single year of age and sex) and components of change (fertility, mortality, and migration) are available from an initial or base year through 2100 for July 1 of each calendar year.

This level of detail provides an important foundation for tracking the demographic impacts of major events that are affecting populations around the globe, including disasters and the HIV/AIDS pandemic.

We update the IDB regularly to deliver the latest information for your educational, research, program planning, and policymaking needs.

See the latest IDB release notes page and the countries and areas page for information on the latest available data. See also our errata page.

How to Access

You can access the IDB in several ways:

Questions or Comments?

Please see the IDB frequently asked questions (FAQs) page. If you have any further questions or comments, please see our contact page


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