Twin Rocks is an unincorporated community in Tillamook County, Oregon, United States, on the Oregon Coast. Twin Rocks, founded as a summer resort community, was named for two 100-foot-high rocks offshore in the Pacific Ocean. Twin Rocks post office was established in 1914, with William E. Dunsmoor as the first postmaster. The post office closed in 1954. Twin Rocks is located near two other unincorporated communities in Tillamook County, Barview and Watseco. The three communities are all along a 3-mile stretch of U.S. Route 101 between the cities of Rockaway Beach and Garibaldi.