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is a census-designated place (CDP) in Mason County, Washington, United States. The population was 2,004 at the 2000 census. The community-based monthly newspaper called the
, 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 .
Allyn-Grapeview is located at (47.364866, -122.835956), on the western shore of North Bay region of Puget Sound's Case Inlet.
According to the United States Census Bureau, the CDP has a total area of 13.8 square miles (35.7 km²), of which, 8.5 square miles (21.9 km²) of it is land and 5.3 square miles (13.8 km²) of it (38.62%) is water.