The State of Vatican City is the headquarters of the Roman Catholic Church. It is the world's smallest independent ' country ' with a population of about Country Calling Code : +. Vatican City officially Vatican City State or the State of Vatican City (Italian: Stato della Città del Vaticano; Latin: Status Civitatis Vaticanae), is a country located Religion : Roman Catholicism. Vatican City is the smallest country in the world. Encircled by a 2-mile border with Italy, Vatican City is an independent city-state that covers just.