Feasterville-Trevose is a former census-designated place (CDP) in Lower Southampton Township in Bucks County, Pennsylvania. The population was 6,525 at the 2000 census. The area has been separated into two CDPs in the 2010 census, Feasterville and Trevose.The Feasterville-Trevose CDP referred to by the U.S. Census Bureau encompasses a portion of Lower Southampton Township, but other sections of the township to the west and south are commonly considered parts of Feasterville, while the community of Trevose extends into Bensalem Township. Lower Southampton to the north is part of the Langhorne Post Office. (19047) The CDP is actually a relatively densely populated residential area between the two communities' central business districts. According to the United States Census Bureau, the CDP has a total area of 1.3 square miles (3.4 km2), all of it land.