Rockaway Beach is a city in Tillamook County, Oregon, United States. The population was 1,312 at the 2010 census. The city houses the Rockaway Beach Old Growth Cedar Preserve, a 46-acre wetlands preserve which opened in 2019. The preserve has an elevated walkway, which terminates at a large cedar tree known as The Big Tree, which is estimated to be 500–900 years old.