Below is a list of Saint Marys County MD zip codes. For your research we have also included Saint Marys County Area Code, Time Zone, UTC and the local County FIPS Code. Each Saint Marys County Maryland zip code has a center Longitude / Latitude point (the Saint Marys County center is -76.582397460938 / 38.260799407959). For your convenience we have also indicated if that zip code in Saint Marys County observes Daylight Savings time.