Below is a list of Saint Charles County MO zip codes. For your research we have also included Saint Charles County Area Code, Time Zone, UTC and the local County FIPS Code. Each Saint Charles County Missouri zip code has a center Longitude / Latitude point (the Saint Charles County center is -90.674797058105 / 38.778198242188). For your convenience we have also indicated if that zip code in Saint Charles County observes Daylight Savings time.