Below is a list of Byrnes Mill MO zip codes. For your research we have also included Byrnes Mill Area Code, Time Zone, UTC and the local Jefferson County FIPS Code. Each Byrnes Mill Missouri zip code has a center Longitude / Latitude point (the Byrnes Mill center is -90.558898925781 / 38.412033081055). For your convenience we have also indicated if that zip code in Byrnes Mill observes Daylight Savings time.