Below is a list of Callahan FL zip codes. For your research we have also included Callahan Area Code, Time Zone, UTC and the local Nassau County FIPS Code. Each Callahan Florida zip code has a center Longitude / Latitude point (the Callahan center is -81.829803466797 / 30.56369972229). For your convenience we have also indicated if that zip code in Callahan observes Daylight Savings time.