Below is a list of Callahan County TX zip codes. For your research we have also included Callahan County Area Code, Time Zone, UTC and the local County FIPS Code. Each Callahan County Texas zip code has a center Longitude / Latitude point (the Callahan County center is -99.314399719238 / 32.325698852539). For your convenience we have also indicated if that zip code in Callahan County observes Daylight Savings time.