The Diocese of Philadelphia is a Roman Catholic diocese located in Pennsylvania, established in 1808. It serves as a spiritual and administrative center for Catholics in the region, overseeing parishes, schools, and various ministries. The diocese is part of the larger United States Conference of Catholic Bishops and is led by a bishop. The diocese's headquarters is at the Cathedral Basilica of Saints Peter and Paul, which is the mother church of the diocese. It encompasses several counties, providing religious services, education, and community support to its members. The diocese also engages in various outreach programs to assist those in need.