What are the Old Lycoming, Pennsylvania Zip Codes for 2020, 2019Primary Zip Codes for Old LycomingZip CodePrimary CitySecondary City17701WilliamsportOld Lycoming, Barbours, Center City, Grampian Hls, Grimesville, Heshbon Park, Loyalsock, Newberry, Plunketts Crk, Proctor, Towncrest Vlg, Vallamont Hls, Warrensville, FaxonCities sharing Zip Codes with Old LycomingZip CodePrimary CitySecondary CityMore Information17701WilliamsportBarbours17701WilliamsportCenter City17701WilliamsportGrampian Hls17701WilliamsportGrimesville17701WilliamsportHeshbon Park17701WilliamsportLoyalsock17701WilliamsportNewberry17701WilliamsportOld Lycoming17701WilliamsportPlunketts Crk17701WilliamsportProctor17701WilliamsportTowncrest Vlg17701WilliamsportVallamont Hls17701WilliamsportWarrensville17701WilliamsportFaxon Faxon population stats Advertisements