Fairfax was a coal town in Pierce County in the U.S. state of Washington. The town was located on the Carbon River about 6 mi south of Carbonado, Washington, on SR 165. Mining lasted only until the minerals ceased to be economically viable following World War I. Until the completion of the nearby 240 ft high O'Farrell Bridge in 1921 (the highest bridge in the state at the time), the town was only accessible via railroad or pack train.