Below is a list of Eaton County MI zip codes. For your research we have also included Eaton County Area Code, Time Zone, UTC and the local County FIPS Code. Each Eaton County Michigan zip code has a center Longitude / Latitude point (the Eaton County center is -84.813102722168 / 42.633499145508). For your convenience we have also indicated if that zip code in Eaton County observes Daylight Savings time.