Grays River is a census-designated place (CDP) in Wahkiakum County, Washington. Grays River stands on the north bank of the lower Grays River, which flows into the Columbia River estuary. The National Register of Historic Places-listed Grays River Covered Bridge crosses the Grays River in the community. It is the only such bridge still in use in Washington. The population was 263 as of the 2010 census.