Below is a list of Washita County OK zip codes. For your research we have also included Washita County Area Code, Time Zone, UTC and the local County FIPS Code. Each Washita County Oklahoma zip code has a center Longitude / Latitude point (the Washita County center is -99.037803649902 / 35.315399169922). For your convenience we have also indicated if that zip code in Washita County observes Daylight Savings time.