Below is a list of Gaston OR zip codes. For your research we have also included Gaston Area Code, Time Zone, UTC and the local Washington County FIPS Code. Each Gaston Oregon zip code has a center Longitude / Latitude point (the Gaston center is -123.13999938965 / 45.437198638916). For your convenience we have also indicated if that zip code in Gaston observes Daylight Savings time.