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About Sunnyside

Sunnyside is a city in Yakima County, Washington, United States. The population was 16,375 at the 2020 census. == History == Up through the early portion of the 19th century, the portion of the Yakima Valley where Sunnyside is now located was inhabited by the "Taptat-ħlama" (or ″People at the rapids"). These people hunted and fished along Yakima River from the mouth of Satus Creek (contained in present-day Satus immediately southwest of Sunnyside) to present Kiona, with a key fishery at near present-day Prosser. Several tribes in the region were relocated onto the Yakama Indian Reservation following the 1855 signing of a treaty with the federal government. However, the Yakima War lingered until 1858, with Chief Kamiakin fighting on until the Battle of Four Lakes in 1858. The modern settlement of Sunnyside was founded by Walter Granger in 1893. The name was coined by a merchant named W. H. Cline. Granger was involved in the financing and construction of the Sunnyside Canal which would have allowed Yakima River water to irrigate the area. However, due to the Panic of 1893, Granger's creditors foreclosed on the canal, and the town's population dwindled to seven families.