Prospect Branch is a long third-order tributary to Marshyhope Creek in Kent County, Delaware.
Prospect Branch rises on the Browns Branch divide about 1-mile west of Harrington, Delaware, and then flows generally southwest to join Marshyhope Creek about 1.5 miles northwest of Adamsville, Delaware.
Prospect Branch drains of area, receives about 45.2 in/year of precipitation, and is about 6.85% forested.