Below is a list of Countyline OK zip codes. For your research we have also included Countyline Area Code, Time Zone, UTC and the local Stephens County FIPS Code. Each Countyline Oklahoma zip code has a center Longitude / Latitude point (the Countyline center is -97.569198608398 / 34.445098876953). For your convenience we have also indicated if that zip code in Countyline observes Daylight Savings time.