Below is a list of Mcclain County OK zip codes. For your research we have also included Mcclain County Area Code, Time Zone, UTC and the local County FIPS Code. Each Mcclain County Oklahoma zip code has a center Longitude / Latitude point (the Mcclain County center is -97.445198059082 / 35.050498962402). For your convenience we have also indicated if that zip code in Mcclain County observes Daylight Savings time.