Below is a list of Roundhead OH zip codes. For your research we have also included Roundhead Area Code, Time Zone, UTC and the local Hardin County FIPS Code. Each Roundhead Ohio zip code has a center Longitude / Latitude point (the Roundhead center is -83.835403442383 / 40.559101104736). For your convenience we have also indicated if that zip code in Roundhead observes Daylight Savings time.