Below is a list of Riverdale MI zip codes. For your research we have also included Riverdale Area Code, Time Zone, UTC and the local Gratiot County FIPS Code. Each Riverdale Michigan zip code has a center Longitude / Latitude point (the Riverdale center is -84.834602355957 / 43.385200500488). For your convenience we have also indicated if that zip code in Riverdale observes Daylight Savings time.