Williamsport, PA

ZIP code 17705 is located in Allenwood, in Lycoming County, Pennsylvania. This rural area is home to the infamous United States Penitentiary, Allenwood, a high-security federal prison. The landmark draws attention to the area, along with its natural surroundings of forests and farmlands. The ZIP code also covers parts of White Deer Township, creating a mix of residential areas and agricultural land.