Below is a list of Riverside WA zip codes. For your research we have also included Riverside Area Code, Time Zone, UTC and the local Okanogan County FIPS Code. Each Riverside Washington zip code has a center Longitude / Latitude point (the Riverside center is -119.51000213623 / 48.500999450684). For your convenience we have also indicated if that zip code in Riverside observes Daylight Savings time.