The Roman Catholic Archdiocese of Washington is a Catholic archdiocese in the United States. Washington, D.C. and five counties in the state of Maryland (Calvert, Charles, Montgomery, Prince George's and Saint Mary's) are in the archdiocese. It was made in 1939 by Pope Pius XII. Before that, the areas now in the Archdiocese of Washington were in the Archdiocese of Baltimore. The Catholic University of America and Georgetown University are also in the archdiocese. 655,000 Catholics are part of the archdiocese.