Below is a list of Mahoning County OH zip codes. For your research we have also included Mahoning County Area Code, Time Zone, UTC and the local County FIPS Code. Each Mahoning County Ohio zip code has a center Longitude / Latitude point (the Mahoning County center is -80.716400146484 / 41.037998199463). For your convenience we have also indicated if that zip code in Mahoning County observes Daylight Savings time.