Below is a list of Ionia MI zip codes. For your research we have also included Ionia Area Code, Time Zone, UTC and the local Ionia County FIPS Code. Each Ionia Michigan zip code has a center Longitude / Latitude point (the Ionia center is -85.070297241211 / 42.979499816895). For your convenience we have also indicated if that zip code in Ionia observes Daylight Savings time.