Below is a list of Great Mills MD zip codes. For your research we have also included Great Mills Area Code, Time Zone, UTC and the local Saint Marys County FIPS Code. Each Great Mills Maryland zip code has a center Longitude / Latitude point (the Great Mills center is -76.495796203613 / 38.237300872803). For your convenience we have also indicated if that zip code in Great Mills observes Daylight Savings time.