Snoqualmie Pass is a census-designated place in King and 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.With Interstate 90 and the King County/Kittitas County lines splitting Snoqualmie Pass at roughly perpendicular directions, the community lies in two counties, two different zip codes from two different main post offices, two different congressional districts and two different legislative districts. None of these districts have the same border in the community.