Sunnyside, WA is a city located in Yakima County, Washington and has a land area of 544.64 square miles (1,410.61 km2). The water area for the city is 10.63 square miles or 27.53 km2. There is one unique zip code in Sunnyside, Washington and it is 98944. The area code(s) for Sunnyside is 509.
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