Hermosa Beach is a beachfront city in Los Angeles County in the U.S. state of California, United States. Its population was 19,728 at the 2020 U.S. Census. The city is located in the South Bay region of the Greater Los Angeles area; it is one of the three Beach Cities. Hermosa Beach is bordered by the other two, Manhattan Beach to the north and Redondo Beach to the south and east.