CountryDataは，広範囲に渡るソースに基づくもので，Wolfram Researchが人間およびアルゴリズムによる処理によってその質を高めたものである．CountryDataは，使用可能な最新情報で継続的に管理されており，CountryDataがWolfram言語内で使用された場合には自動更新される．

CountryDataの主要な出典を以下に挙げる．

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. »

CountryDataの間違いを見付けられた場合，あるいはCountryDataに追加する情報についてご提案がおありの場合は，Wolfram ResearchのCountryDataチームまでご連絡ください．