Goldendale is a city and county seat of Klickitat County, Washington, United States, near the Columbia River Gorge. The population within city limits was 3,760 at the 2000 census and 3,407 at the 2010 census, a 9.4% decrease. It is situated in a primarily agricultural area and is also near Goldendale Observatory State Park. The valley in which Goldendale is located offers views of the Cascade Mountains to the west and the Simcoe Mountains to the north.