Below is a list of Grundy County IA zip codes. For your research we have also included Grundy County Area Code, Time Zone, UTC and the local County FIPS Code. Each Grundy County Iowa zip code has a center Longitude / Latitude point (the Grundy County center is -92.778602600098 / 42.368099212646). For your convenience we have also indicated if that zip code in Grundy County observes Daylight Savings time.