Keystone is a small unincorporated community on Whidbey Island in Washington State

Located near the center of Whidbey Island and about 3 miles south of Coupville, Washington State Ferries travel from Keystone across Admiralty Inlet to deliver ferry travellers to the Olympic Peninsula via Port Townsend.

During the summer months in particular, the Keystone - Port Townsend ferry traffic can be heavy