Below is a list of Dewey OK zip codes. For your research we have also included Dewey Area Code, Time Zone, UTC and the local Washington County FIPS Code. Each Dewey Oklahoma zip code has a center Longitude / Latitude point (the Dewey center is -95.935096740723 / 36.785999298096). For your convenience we have also indicated if that zip code in Dewey observes Daylight Savings time.