Tags: Clerical Administrative Region, Diocese.
The Roman Catholic Diocese of Rockville Centre (Latin: Dioecesis Petropolitana in Insula Longa) comprises the territory of Nassau and Suffolk counties (regionally known as Long Island) in New York state USA. Founded in 1957 this diocese was created from territory that once belonged to the Diocese of Brooklyn. It is the sixth-largest Catholic diocese in the United States currently serving approximately 1.5 million people in 134 parishes.
