Below is a list of Williamsport MD zip codes. For your research we have also included Williamsport Area Code, Time Zone, UTC and the local Washington County FIPS Code. Each Williamsport Maryland zip code has a center Longitude / Latitude point (the Williamsport center is -77.819000244141 / 39.600498199463). For your convenience we have also indicated if that zip code in Williamsport observes Daylight Savings time.