Below is a list of Gilman IA zip codes. For your research we have also included Gilman Area Code, Time Zone, UTC and the local Marshall County FIPS Code. Each Gilman Iowa zip code has a center Longitude / Latitude point (the Gilman center is -92.783798217773 / 41.876899719238). For your convenience we have also indicated if that zip code in Gilman observes Daylight Savings time.