Since 1798, the Catholic Church has risen to global prominence. Its recovery accelerated when Mussolini restored Vatican City to the Church in the Lateran Accords (February, 1929). Today, the Catholic Church claims more than 1.5 billion members and its popes often meet with heads of state around the world. If you think it through, the pope’s coming advancement as “first among equals” is not hard to anticipate. No other religious system on Earth is globally organized and politically recognized like the Catholic Church. The Roman Catholic Church is unique among the religious systems of the world in that it currently has diplomatic relations with 179 countries.
Following is a document taken from Wikipedia. Here is the Link: https://en.wikipedia.org/wiki/List_of_diplomatic_missions_of_the_Holy_See