Ipinle Washington je ikan ninu awon ipinle 50 ni orile-ede Amerika State Symbols "Annual Estimates of the Resident Population for the United States, Regions, States, and Puerto Rico: April 1, 2000 to July 1, 2009". United States Census Bureau. Retrieved 2009-12-30.  "Elevations and Distances in the United States". U.S Geological Survey. 29 April 2005. Retrieved November 9 2006.  Unknown parameter |dateformat= ignored (help); Check date values in: |access-date= (help)