Below is a list of Mcmullen County TX zip codes. For your research we have also included Mcmullen County Area Code, Time Zone, UTC and the local County FIPS Code. Each Mcmullen County Texas zip code has a center Longitude / Latitude point (the Mcmullen County center is -98.538497924805 / 28.346700668335). For your convenience we have also indicated if that zip code in Mcmullen County observes Daylight Savings time.