Andalusia is a historic neighborhood in Bensalem Township, Bucks County, Pennsylvania, bordering Philadelphia. The ZIP code is 19020. The area is the southernmost part of the township and of the county. Its boundaries are: Woodhaven Road (Pennsylvania Route 63) to the northeast, the Delaware River to the east and south, and Poquessing Creek to the north and west. Interstate 95 runs through its southeastern section near the Delaware River. The neighborhood takes its name from the Andalusia estate of Philadelphia financier Nicholas Biddle (1786–1844), now preserved as a National Historic Landmark.