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Illustrative Projections of World Populations to the 21st Century

Report Number P23-79

This report presents population projections through the end of the 20th century. This report, supported by the Agency for International Development, shows three projection series (high, medium, low) to indicate reasonable limits for population expansion. The projection series were based upon assumptions about fertility, mortality, and international migration. Estimates and projections are also provided for average growth, birth and death rates, total and age-specified fertility rates, and life expectancy.

Data are presented in 5-year age-sex classifications for individual areas covered. Additional projections are tabulated by "more developed" and "less developed" regions of the world. A special feature of this report is a comparative table showing the estimates and projections of world populations prepared by the World Bank, the United Nations, the Community and Family Study Center of the University of Chicago, and the Bureau of the Census.

Statistics are also pictorially presented through the use of charts, both in the analytical text and in Appendix B, which includes background sources of base-year data and projection assumptions by individual region or country. (Appendix A provides recently revised projections for the People's Republic of China.)

A Note on Language

Census statistics date back to 1790 and reflect the growth and change of the United States. Past census reports contain some terms that today’s readers may consider obsolete and inappropriate. As part of our goal to be open and transparent with the public, we are improving access to all Census Bureau original publications and statistics, which serve as a guide to the nation's history.

Page Last Revised - October 8, 2021
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