Snoqualmie Pass is a census-designated place (CDP) in Kittitas County, Washington, United States. The population was 311 at the 2010 census.The CDP is named for the mountain pass that carries Interstate 90 across the Cascade Range, which itself is named for the Snoqualmie tribe, a Native American tribe indigenous to the Snoqualmie Valley located west of the pass.Based on per capita income, Snoqualmie Pass ranks 8th of 522 areas in the state of Washington to be ranked. It is also the highest rank achieved in Kittitas County.