Below is a list of Ontonagon MI zip codes. For your research we have also included Ontonagon Area Code, Time Zone, UTC and the local Ontonagon County FIPS Code. Each Ontonagon Michigan zip code has a center Longitude / Latitude point (the Ontonagon center is -89.31379699707 / 46.870998382568). For your convenience we have also indicated if that zip code in Ontonagon observes Daylight Savings time.