World Population over Time

Historical Estimates of World Population

(Population in millions. When lower and upper estimates are the same they are shown under "Lower.")

Sources:

Biraben, Jean-Noel, 1980, An Essay Concerning Mankind's Evolution,
Population, Selected Papers, December, table 2.

Durand, John D., 1974, "Historical Estimates of World Population: An Evaluation,"
University of Pennsylvania, Population Center,
Analytical and Technical Reports, Number 10, table 2.

Haub, Carl, 1995, "How Many People Have Ever Lived on Earth?"
Population Today, February, p. 5.

McEvedy, Colin and Richard Jones, 1978, "Atlas of World Population History,"
Facts on File, New York, pp. 342-351.

Thomlinson, Ralph, 1975, "Demographic Problems, Controversy Over Population Control,"
Second Edition, Table 1.

United Nations (UN), 1973, The Determinants and Consequences of
Population Trends, Population Studies, No. 50., p.10.

United Nations, 1999, The World at Six Billion, Table 1, "World Population From"
Year 0 to Stabilization, p. 5,
http://www.un.org/esa/population/publications/sixbillion/sixbilpart... longdesc="This link to a non-federal Web site does not imply endorsement of any particular product, company, or content." title="This link to a non-federal Web site does not imply endorsement of any particular product, company, or content."
alt="This link to a non-federal Web site does not imply endorsement of any particular product, company, or content." />

U.S. Census Bureau (USCB), 2008, "Total Midyear Population for the World: 1950-2050",
Data updated 12-15-2008,
http://www.census.gov/ipc/www/idb/worldpop.html