Below is a list of Millstadt IL zip codes. For your research we have also included Millstadt Area Code, Time Zone, UTC and the local Saint Clair County FIPS Code. Each Millstadt Illinois zip code has a center Longitude / Latitude point (the Millstadt center is -90.091697692871 / 38.460601806641). For your convenience we have also indicated if that zip code in Millstadt observes Daylight Savings time.