Below is a list of Gratis OH zip codes. For your research we have also included Gratis Area Code, Time Zone, UTC and the local Preble County FIPS Code. Each Gratis Ohio zip code has a center Longitude / Latitude point (the Gratis center is -84.528099060059 / 39.648700714111). For your convenience we have also indicated if that zip code in Gratis observes Daylight Savings time.