The Roman Catholic Diocese of St. Petersburg was established on June 17, 1968, with territory taken from the Diocese of St. Augustine and the Diocese of Miami. It is a suffragan see of the Province of Miami along with the Dioceses of St. Augustine, Orlando, Pensacola-Tallahassee, and Venice. Situated on Florida's west coast, along the Gulf of Mexico, the diocese covers 3,177 square miles in five counties: Pinellas, Hillsborough, Pasco, Hernando, and Citrus. The principal cities of the diocese are St. Petersburg, Tampa, and Clearwater. The diocese serves a total population of approximately 2,900,000, of whom over 425,000 are Catholic.