Below is a list of Gallia County OH zip codes. For your research we have also included Gallia County Area Code, Time Zone, UTC and the local County FIPS Code. Each Gallia County Ohio zip code has a center Longitude / Latitude point (the Gallia County center is -82.305099487305 / 38.867198944092). For your convenience we have also indicated if that zip code in Gallia County observes Daylight Savings time.