The Roman Catholic Diocese of Pittsburgh (Latin: Dioecesis Pittsburgensis) is a Roman Catholic diocese. It was established in Western Pennsylvania on August 11, 1843. The diocese includes 211 parishes in the counties of Allegheny, Beaver, Butler, Greene, Lawrence, and Washington, an area of 3,753 square miles (9,720 km2) with a Catholic population of 719,801 as of June 2008. The cathedral church of the diocese is the Cathedral of Saint Paul. As of March 2009, the diocese had 280 active priests. The diocese is in the process of reorganizing its schools; sixteen elementary schools have been closed since 2005.