Below is a list of Old Washington OH zip codes. For your research we have also included Old Washington Area Code, Time Zone, UTC and the local Guernsey County FIPS Code. Each Old Washington Ohio zip code has a center Longitude / Latitude point (the Old Washington center is -81.445198059082 / 40.037700653076). For your convenience we have also indicated if that zip code in Old Washington observes Daylight Savings time.