Valley is a census-designated place and unincorporated community in Stevens County, Washington, United States. In the 2010 census the population was 146. The town of Valley was named by Daniel C. Corbin. Mr. Corbin named the town Valley, because it is at the entrance to the Colville Valley. The Spokane Falls and Northern Railway was connected to Valley in 1889. D. C.Corbin set up a small building for a depot.