Below is a list of Fairfield OH zip codes. For your research we have also included Fairfield Area Code, Time Zone, UTC and the local Butler County FIPS Code. Each Fairfield Ohio zip code has a center Longitude / Latitude point (the Fairfield center is -84.540397644043 / 39.329898834229). For your convenience we have also indicated if that zip code in Fairfield observes Daylight Savings time.