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

Among principal sources for CityData are:

Cohen, S., (Ed.) The Columbia Gazetteer of the World. Columbia University Press, 2008.

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

The London Times. Index Gazetteer of the World. Houghton Mifflen, 1966.

Munro, D., Ed. Cambridge World Gazetteer: A Geographical Dictionary. Cambridge University Press, 1990.

Room, A. Place-Name Changes Since 1900: A World Gazetteer. Scarecrow Press, 1979.

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

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

United States Census Bureau. "Metropolitan and Micropolitan Statistical Areas and Components." 2006. »

United States Census Bureau. "Population Estimates Data Sets." 2006. »

United States Census Bureau. "The 2008 Statistical Abstract." 2008. »

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

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

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

van der Heyden, J. "GeoHive: Global Statistics." 2006. »

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