Below is a list of Guernsey IA zip codes. For your research we have also included Guernsey Area Code, Time Zone, UTC and the local Poweshiek County FIPS Code. Each Guernsey Iowa zip code has a center Longitude / Latitude point (the Guernsey center is -92.342300415039 / 41.649200439453). For your convenience we have also indicated if that zip code in Guernsey observes Daylight Savings time.