Below is a list of Millcreek IL zip codes. For your research we have also included Millcreek Area Code, Time Zone, UTC and the local Union County FIPS Code. Each Millcreek Illinois zip code has a center Longitude / Latitude point (the Millcreek center is -89.270401000977 / 37.351001739502). For your convenience we have also indicated if that zip code in Millcreek observes Daylight Savings time.