Below is a list of Cahokia IL zip codes. For your research we have also included Cahokia Area Code, Time Zone, UTC and the local Saint Clair County FIPS Code. Each Cahokia Illinois zip code has a center Longitude / Latitude point (the Cahokia center is -90.190101623535 / 38.570899963379). For your convenience we have also indicated if that zip code in Cahokia observes Daylight Savings time.