Parker Branch is a long 1st order tributary to Gum Branch in Sussex County, Delaware.
Parker Branch rises on the Beaver Dam Branch divide about 2 miles west-southwest of Ellendale, Delaware and then flows southwest to join Gum Branch about 3 miles southwest of Ellendale.
Parker Branch drains of area, receives about 45.4 in/year of precipitation, has a topographic wetness index of 738.49 and is about 11% forested.