Below is a list of Middlefield OH zip codes. For your research we have also included Middlefield Area Code, Time Zone, UTC and the local Geauga County FIPS Code. Each Middlefield Ohio zip code has a center Longitude / Latitude point (the Middlefield center is -81.072898864746 / 41.462001800537). For your convenience we have also indicated if that zip code in Middlefield observes Daylight Savings time.