Below is a list of Gray Summit MO zip codes. For your research we have also included Gray Summit Area Code, Time Zone, UTC and the local Franklin County FIPS Code. Each Gray Summit Missouri zip code has a center Longitude / Latitude point (the Gray Summit center is -90.812797546387 / 38.493698120117). For your convenience we have also indicated if that zip code in Gray Summit observes Daylight Savings time.