Below is a list of Allegan County MI zip codes. For your research we have also included Allegan County Area Code, Time Zone, UTC and the local County FIPS Code. Each Allegan County Michigan zip code has a center Longitude / Latitude point (the Allegan County center is -85.858901977539 / 42.605400085449). For your convenience we have also indicated if that zip code in Allegan County observes Daylight Savings time.