Located in North Central Washington and part of Grant County, the city has a total area of 1.36 miles and was incorporated on November 6, 1935. Population was 1067 at the 2019 census. Grand Coulee is home to the Grand Coulee Dam, the largest hydro-power generating facility in the United States, which also provides water for the Columbia Basin Project. With Lake Roosevelt on its eastern border and Banks Lake to the west, outdoor recreation is a large part of the community. Boating, fishing, hunting, hiking and other activities are enjoyed throughout the year.