The World Factbook is prepared by the Central Intelligence Agency for the use of US Government officials, and the style, format, coverage, and content are designed to meet their specific requirements. Information is provided by Antarctic Information Program (National Science Foundation), Armed Forces Medical Intelligence Center (Department of Defense), Bureau of the Census (Department of Commerce), Bureau of Labor Statistics (Department of Labor), Central Intelligence Agency, Council of Managers of National Antarctic Programs, Defense Intelligence Agency (Department of Defense), Department of Energy, Department of State, Fish and Wildlife Service (Department of the Interior), Maritime Administration (Department of Transportation), National Geospatial-Intelligence Agency (Department of Defense), Naval Facilities Engineering Command (Department of Defense), Office of Insular Affairs (Department of the Interior), Office of Naval Intelligence (Department of Defense), US Board on Geographic Names (Department of the Interior), US Transportation Command (Department of Defense), United Nations Population Division (World Urbanization Prospects: The 2018 Revision and World Population Prospects: The 2019 Revision urbanization and population data used with permission), International Telecommunication Union, International Institute for Strategic Studies, Oil & Gas Journal, and other public and private sources.

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The World Factbook 2019. Washington, DC: Central Intelligence Agency, 2019.

https://www.cia.gov/library/publications/resources/the-world-factbook/index.html

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