Cerritos is a city in Los Angeles County, California, United States, and is one of several cities that constitute the Gateway Cities of southeast Los Angeles County. It was incorporated on April 24, 1956. As of 2019, the population was 49,859. It is part of the Los Angeles–Long Beach–Anaheim, California Metropolitan Statistical Area designated by the Office of Management and Budget. Cerritos was originally inhabited by Native Americans belonging to the Tongva (or "People of the Earth"). The Tongva were called the "Gabrieleños" by the Spanish settlers after the nearby Mission San Gabriel Arcángel. The Tongva were the largest group of indigenous peoples in Southern California and the most developed in the region. One soldier, José Manuel Nieto, was granted a large plot of land by the Spanish King Carlos III, which he named Rancho Los Nietos. It covered 300,000 acres (120,000 hectares) of what are today the cities of Cerritos, Long Beach, Lakewood, Downey, Norwalk, Santa Fe Springs, part of Whittier, Huntington Beach, Buena Park, and Garden Grove.