Below is a list of Worthington IA zip codes. For your research we have also included Worthington Area Code, Time Zone, UTC and the local Dubuque County FIPS Code. Each Worthington Iowa zip code has a center Longitude / Latitude point (the Worthington center is -91.119499206543 / 42.397201538086). For your convenience we have also indicated if that zip code in Worthington observes Daylight Savings time.