 Langley Park is contained between University Boulevard to the south, the Northwest Branch Anacostia River to the north, Phelps Road to the east, and the Prince Georges County / Montgomery County line to the west.An extremely small stretch of Piney Branch Road (MD 320) which goes into Prince George's County, goes into the Langley Park neighborhood as well, just before it crosses the Northwest Branch Anacostia River and intersects New Hampshire Avenue (MD 650).While most of the Langley Park neighborhood contains the Hyattsville postal zip code of 20783, there is a small portion of Langley Park located west of New Hampshire Avenue (MD 650), but east of the Prince George's County/ Montgomery County Line, which contains the Silver Spring postal zip code of 20903.