Below is a list of Williamston MI zip codes. For your research we have also included Williamston Area Code, Time Zone, UTC and the local Ingham County FIPS Code. Each Williamston Michigan zip code has a center Longitude / Latitude point (the Williamston center is -84.283203125 / 42.68920135498). For your convenience we have also indicated if that zip code in Williamston observes Daylight Savings time.