Below is a list of Castalia IA zip codes. For your research we have also included Castalia Area Code, Time Zone, UTC and the local Winneshiek County FIPS Code. Each Castalia Iowa zip code has a center Longitude / Latitude point (the Castalia center is -91.679702758789 / 43.114101409912). For your convenience we have also indicated if that zip code in Castalia observes Daylight Savings time.