Below is a list of Foss OK zip codes. For your research we have also included Foss Area Code, Time Zone, UTC and the local Washita County FIPS Code. Each Foss Oklahoma zip code has a center Longitude / Latitude point (the Foss center is -99.170196533203 / 35.450698852539). For your convenience we have also indicated if that zip code in Foss observes Daylight Savings time.