Keystone, Island County, Washington
Keystone is a small unincorporated community on Whidbey Island in Island County, Washington, in the northwestern United States. It is near the Coupeville Ferry Landing, a dock for the Washington State Ferries route to Port Townsend that provides a maritime link for State Route 20 across Admiralty Inlet. It is located about 3 miles due south of Coupeville near Fort Casey State Park and Ebey's Prairie National Historic Preserve.
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