Roman Catholic Diocese of Davenport Tags: Clerical Administrative Region, Diocese.The Roman Catholic Diocese of Davenport (Latin: Dioecesis Davenportensis) is a diocese of the Catholic Church for the southeastern quarter of the U.S. state of Iowa. There are 11438 square miles (29620 km2) within the diocese. thumbnail point area (km2) 2.96243e+10 Established June 14 1881 ( years ago) jurisdiction Diocese location Roman_Catholic_Diocese_of_Davenport__location__1 province Roman Catholic Archdiocese of Dubuque latitude 41.5468 longitude -90.5828 Learn more... Loading...