Boulder Creek is a small rural mountain community in the coastal Santa Cruz Mountains. It is a census-designated place in Santa Cruz County, California, with a population of 5,429 as of the 2020 census. Throughout its history, Boulder Creek has been home to a logging town and a resort community, as well as a counter-culture haven. Today, it is identified …Boulder Creek is a small rural mountain community in the coastal Santa Cruz Mountains. It is a census-designated place in Santa Cruz County, California, with a population of 5,429 as of the 2020 census. Throughout its history, Boulder Creek has been home to a logging town and a resort community, as well as a counter-culture haven. Today, it is identified as the gateway to Big Basin Redwoods State Park.