Below is a list of Holts Summit MO zip codes. For your research we have also included Holts Summit Area Code, Time Zone, UTC and the local Callaway County FIPS Code. Each Holts Summit Missouri zip code has a center Longitude / Latitude point (the Holts Summit center is -92.116996765137 / 38.64820098877). For your convenience we have also indicated if that zip code in Holts Summit observes Daylight Savings time.