Inchelium is a census-designated place in Ferry County, Washington, United States on the Colville Indian Reservation. The population was 431 at the 2020 Census. Inchelium was relocated from an earlier site in the early 1940s. Old Inchelium had been located on the banks of the Columbia River before the construction of the Grand Coulee Dam. As the waters rose behind the dam, the town had to be moved.