Below is a list of Saint Marys IA zip codes. For your research we have also included Saint Marys Area Code, Time Zone, UTC and the local Warren County FIPS Code. Each Saint Marys Iowa zip code has a center Longitude / Latitude point (the Saint Marys center is -93.731498718262 / 41.308101654053). For your convenience we have also indicated if that zip code in Saint Marys observes Daylight Savings time.