Below is a list of Shiawassee County MI zip codes. For your research we have also included Shiawassee County Area Code, Time Zone, UTC and the local County FIPS Code. Each Shiawassee County Michigan zip code has a center Longitude / Latitude point (the Shiawassee County center is -84.129997253418 / 42.924800872803). For your convenience we have also indicated if that zip code in Shiawassee County observes Daylight Savings time.