Redondo Beach is a coastal city in Los Angeles County, California, United States, located in the South Bay region of the Greater Los Angeles area. It is one of three adjacent beach cities along the southern portion of Santa Monica Bay. The population was 71,576 at the 2020 census, up from 66,748 at the 2010 census. Redondo Beach was originally part of the 1785 Rancho San Pedro Spanish land grant that later became the South Redondo area.