Comprises that part of the State of Iowa bounded east by the eastern boundaries of the counties of Polk, Warren, Lucas, and Wayne, south by the State of Missouri, west by the Missouri River, and north by the northern boundaries of the counties of Harrison, Shelby, Audubon, Guthrie, Dallas, and Polk; area, 12,446 square miles; erected, 1911; suffragan of Dubuque. For a list of bishops and additional information, see Catholic-Hierarchy.Org.