Below is a list of Calhoun MO zip codes. For your research we have also included Calhoun Area Code, Time Zone, UTC and the local Henry County FIPS Code. Each Calhoun Missouri zip code has a center Longitude / Latitude point (the Calhoun center is -93.625198364258 / 38.467399597168). For your convenience we have also indicated if that zip code in Calhoun observes Daylight Savings time.