High Quality Content by WIKIPEDIA articles! This is a list of churches in the Roman Catholic Archdiocese of New Orleans. The archdiocese encompasses 8 civil parishes in Louisiana: Jefferson, Orleans, Plaquemines, St. Charles, St. John the Baptist, St. Tammany, and Washington. There are 108 parishes within the archdiocese. As of June 1, 2009, the archdiocese`s parishes are organized into ten deaneries.