Below is a list of Caldwell KS zip codes. For your research we have also included Caldwell Area Code, Time Zone, UTC and the local Sumner County FIPS Code. Each Caldwell Kansas zip code has a center Longitude / Latitude point (the Caldwell center is -97.607002258301 / 37.032501220703). For your convenience we have also indicated if that zip code in Caldwell observes Daylight Savings time.