Below is a list of Shannon City IA zip codes. For your research we have also included Shannon City Area Code, Time Zone, UTC and the local Union County FIPS Code. Each Shannon City Iowa zip code has a center Longitude / Latitude point (the Shannon City center is -94.264503479004 / 40.901901245117). For your convenience we have also indicated if that zip code in Shannon City observes Daylight Savings time.