Below is a list of Dayton WA zip codes. For your research we have also included Dayton Area Code, Time Zone, UTC and the local Columbia County FIPS Code. Each Dayton Washington zip code has a center Longitude / Latitude point (the Dayton center is -117.97899627686 / 46.320400238037). For your convenience we have also indicated if that zip code in Dayton observes Daylight Savings time.