Allyn-Grapeview is a census-designated place (CDP) in Mason County, Washington, United States. The population was 2,917 at the 2010 census. The community-based monthly newspaper called the North Bay Review, services the Allyn-Grapeview area. Allyn's main road and thoroughfare is State Route 3 with Grapeview connected to Route 3 via Grapeview Loop Road.Grapeview is home to a small Puget Sound Maritime Museum, and the Fair Harbor Marina.