Below is a list of Griswold IA zip codes. For your research we have also included Griswold Area Code, Time Zone, UTC and the local Cass County FIPS Code. Each Griswold Iowa zip code has a center Longitude / Latitude point (the Griswold center is -95.137199401855 / 41.234798431396). For your convenience we have also indicated if that zip code in Griswold observes Daylight Savings time.