United States Senate / No Interstate Commission / House of Representatives District Area / U.S. Bureau of the Census / U.S. House of Representatives / /
Person
Carroll Berkeley Frederick Tucker / Gerald E. Connolly / Eleanor Holmes Norton / Bob Casey / Washington Morgan / Grant Hardy Shenandoah Warren / Joseph Manchin / Barbara A. Mikulski / Jefferson Clarke / James Moran / Frederick Alexandria Pendleton / Chris Van Hollen / Mark R. Warner / John P. Sarbanes / F. Edwards (D) Fulton / George Augusta / John D. Rockefeller / IV / Norton (D) Maryland Cumberland Somerset / Virginia King / Tim Kaine / Donna F. Edwards / Benjamin L. Cardin / John Delaney (D) Adams Garrett / Franklin Allegany Preston Mineral Hampshire / /
Potomac River Basin 113th U.S. Congressional Districts and Counties U.S. House of Representatives District Area within the Potomac Watershed