The Great Blue Heron (Ardea herodias) has been common in western Washington throughout recorded history (Jewett et al. 1953). Shipe and Scott (1981) surveyed Great Blue Heron colonies in King County for the Washington Department of Wildlife. In 1983, the Department resurveyed three of the colonies noted by Shipe and Scott. In this paper, I update information on Great Blue Heron colonies in this area.