Below is a list of Rio Hondo TX zip codes. For your research we have also included Rio Hondo Area Code, Time Zone, UTC and the local Cameron County FIPS Code. Each Rio Hondo Texas zip code has a center Longitude / Latitude point (the Rio Hondo center is -97.582099914551 / 26.235300064087). For your convenience we have also indicated if that zip code in Rio Hondo observes Daylight Savings time.