Below is a list of Fremont IA zip codes. For your research we have also included Fremont Area Code, Time Zone, UTC and the local Mahaska County FIPS Code. Each Fremont Iowa zip code has a center Longitude / Latitude point (the Fremont center is -92.43440246582 / 41.212600708008). For your convenience we have also indicated if that zip code in Fremont observes Daylight Savings time.