South Colby is an unincorporated community in Kitsap County, Washington, United States. It is located on Yukon Harbor, west of the Southworth Ferry Dock. From there, a ferry is available to Fauntleroy in the West Seattle neighborhood of Seattle. South Colby is part of the Southworth census-designated place. Colby is a shortening and alteration of "Coal Bay". References Unincorporated communities in Washington (state) Unincorporated communities in Kitsap County, Washington