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The International Data Base (IDB) provides accurate and timely demographic measures of over 200 countries and areas of the world. The IDB includes a comprehensive set of indicators such as total population, population by age and sex, and demographic characteristics such as fertility, mortality, and migration.

The Census Bureau has produced international population estimates and projections since the 1960s, and the IDB has been available on since 1996. With sponsorship from various U.S. Government agencies, the IDB is updated on a regular basis to deliver information needed for research, program planning, and policymaking decisions in the U.S. and globally.

Data included in the IDB consist of indicators from censuses, surveys, administrative records, and special measures of HIV/AIDS-related mortality. Through evaluation and adjustment of data from these sources, the Census Bureau estimates measures of population, mortality, fertility, and net migration for the current and past years and then projects trends forward to 2100.

The IDB includes estimates and projections for 228 countries and areas with populations of 5,000 or more. 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 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.


The IDB is designed to provide customers with open access to quality data that can inform research, program planning, and policy making.   Estimates and projections provided in the IDB are developed through the evaluation and adjustment of data from reliable sources and with the cohort-component projection methodology. 

Documentation on how the cohort-component methodology is applied in generating IDB data is available in .pdf form that can be viewed, printed, or saved. 

pdf Methodology [<1.0 MB]
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