Almost all of Vatican City's 451 (2015) citizens either live inside the Vatican's walls or serve in the Holy See's diplomatic service in embassies (called "nunciature"; a papal ambassador is a "nuncio") around the world.
Vatican City has no formally enacted official language, but, unlike the Holy See which most often uses Latin for the authoritative version of its official documents, Vatican City uses only Italian in its legislation and official communications [REF].