Below is a list of Alton MO zip codes. For your research we have also included Alton Area Code, Time Zone, UTC and the local Oregon County FIPS Code. Each Alton Missouri zip code has a center Longitude / Latitude point (the Alton center is -91.398597717285 / 36.69409942627). For your convenience we have also indicated if that zip code in Alton observes Daylight Savings time.