Myrtletown is a census-designated place (CDP) in Humboldt CountyCaliforniaUnited States. Myrtletown lies at an elevation of 112 feet (34 m).[3] Myrtletown is a part of the Eureka, California metropolitan area. The population was 4,675 at the 2010 census, up from 4,459 at the 2000 census.