Below is a list of Ossian IA zip codes. For your research we have also included Ossian Area Code, Time Zone, UTC and the local Winneshiek County FIPS Code. Each Ossian Iowa zip code has a center Longitude / Latitude point (the Ossian center is -91.764801025391 / 43.145698547363). For your convenience we have also indicated if that zip code in Ossian observes Daylight Savings time.