World Factbook by U.S. Central Intelligence Agency This link opens in a new windowThe World Factbook provides information on the history, people and society, government, economy, energy, geography, communications, transportation, military, and transnational issues for 267 world entities. The Reference tab includes: a variety of world, regional, country, ocean, and time zone maps; Flags of the World; and a Country Comparison function that ranks the country information and data in more than 75 Factbook fields.