Manhattan Beach is a city in southwestern Los Angeles County, California, United States, on the Pacific coast south of El Segundo, and north of Hermosa Beach. As of the 2010 census, the population was 35,135, and in 2019 the population was estimated to be 35,183.Manhattan Beach is one of the three Beach Cities, along with Hermosa Beach and Redondo Beach within the South Bay region of Los Angeles County.