Dockton is an unincorporated community in King County, Washington. It is located on Maury Island, along Quartermaster Harbor. Dockton is a primarily residential area, with many commuters taking the ferry to nearby Tacoma. It has been suggested that this article or section be merged with unincorporated. ... King County is located in the U.S. state of Washington. ... Maury Island is a island in Washington States Puget Sound connected Vashon Island by a isthmus built by the U.S Army Corps of Engineers that connects the two. ... Tacoma, with Mount Rainier in background Nickname: The City of Destiny Motto: {{{motto}}} Official website: http://www. ...