Below is a list of Guernsey County OH zip codes. For your research we have also included Guernsey County Area Code, Time Zone, UTC and the local County FIPS Code. Each Guernsey County Ohio zip code has a center Longitude / Latitude point (the Guernsey County center is -81.481002807617 / 39.990200042725). For your convenience we have also indicated if that zip code in Guernsey County observes Daylight Savings time.