Below is a list of Gahanna OH zip codes. For your research we have also included Gahanna Area Code, Time Zone, UTC and the local Franklin County FIPS Code. Each Gahanna Ohio zip code has a center Longitude / Latitude point (the Gahanna center is -82.856399536133 / 40.04460144043). For your convenience we have also indicated if that zip code in Gahanna observes Daylight Savings time.