Below is a list of Gratiot County MI zip codes. For your research we have also included Gratiot County Area Code, Time Zone, UTC and the local County FIPS Code. Each Gratiot County Michigan zip code has a center Longitude / Latitude point (the Gratiot County center is -84.634101867676 / 43.299598693848). For your convenience we have also indicated if that zip code in Gratiot County observes Daylight Savings time.