Below is a list of Smithton IL zip codes. For your research we have also included Smithton Area Code, Time Zone, UTC and the local Saint Clair County FIPS Code. Each Smithton Illinois zip code has a center Longitude / Latitude point (the Smithton center is -89.992202758789 / 38.410301208496). For your convenience we have also indicated if that zip code in Smithton observes Daylight Savings time.