Santiago is a census-designated place (CDP) in Grays Harbor County, Washington, United States. As of 2010, the total population is 42. The population density is 8.93 people per square mile. State Highway 109 is the only road in and out of town. Canyon Way is the next most important road in the community.

Santiago has 1.57 square miles of land area and 0.00 square miles of water area. The coordinates are 47.298889, -124.231389. It is south of Taholah.

The name of the town does not appear on most maps.

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