The Copalis Native Americans belong to the coastal division of the Salishan language family and historically occupied the area of Copalis River and the Pacific Coast between the mouth of Joe Creek and Grays Harbor. In 1805, Lewis and Clark estimated a population of 200 Copalis in 10 houses. The 5 individuals assigned to a "Chepalis" tribe in an enumeration given by Olson of the year 1888 probably refers to them.