Coulee Dam is a town in Douglas, Grant, and Okanogan counties in the state of Washington.

The Douglas County portion of Coulee Dam is part of the Wenatchee–East Wenatchee Metropolitan Statistical Area.

The Okanogan County portion was known as Mason City, location of the head contractor.

The portions in Douglas and Grant Counties were known as Engineers Town and were government-owned.

In 1942, with the end of the contract in sight, CBI transferred control of Mason City to the Municipal Division of the Columbia Basin Project.

The government began the process of selling the town to the public in 1957, finishing in 1959.

It is the headquarters of Lake Roosevelt National Recreation Area and home to one of the world's largest man-made piles of sand, a 12,000,000-cubic-yard (9,200,000 m3), 230-foot (70 m)-high hill remaining from dam construction.

30.5% of all households were made up of individuals, and 12.9% had someone living alone who was 65 years of age or older.