CountryData is based on a wide range of sources, with enhancement at the Wolfram Research Companies by both human and algorithmic processing. CountryData is continually maintained with the latest available information, with automatic updating when CountryData is used inside the Wolfram Language.

Among principal sources for CountryData are:

Encyclopaedia Britannica. Britannica Book of the Year. Encyclopaedia Britannica, 2006.

Helders, S. "World Gazetteer." 2006. »

Lahmeyer, J. "Population Statistics." 2006. »

United Nations Department of Economic and Social Affairs. 2003 Demographic Yearbook. United Nations, 2006.

United Nations Department of Economic and Social Affairs. Statistical Yearbook 2002-2004. United Nations, 2004.

United Nations Statistics Division. "UNdata." 2008. »

United States Census Bureau. "International Data Base (IDB)." 2006. »

United States Census Bureau. "Census 2000 Gateway." 2007. »

United States Central Intelligence Agency. "The World Factbook." 2008. »

United States Department of State. "Background Notes." 2007. »

United States Geological Survey. "GOS: Geospatial One Stop." 2007. »

United States National Geospatial-Intelligence Agency. "NGA GEOnet Names Server (GNS)." 2007. »

University of California at Berkeley. "GADM: Global Administrative Areas." 2008. »

University of Pennsylvania. "Penn World Tables." 2006. »

van der Heyden, J. "GeoHive: Global Statistics." 2008. »

World Health Organization. "WHO Mortality Database: Tables." 2007. »

To report an error or suggest an addition to CountryData, contact the Wolfram Research CountryData team.