El Segundo is a city in Los Angeles County, California, United States. Located on Santa Monica Bay, it was incorporated on January 18, 1917, and is part of the South Bay Cities Council of Governments. The population was 16,731 as of the 2020 census, a 0.5% increase from 16,654 in the 2010 census. A significant center of the oil and aerospace industries in Southern California, roughly three quarters of the city's land is dedicated exclusively to industrial and commercial uses, including a Chevron oil refinery which alone takes up more than a quarter of the entire city.

Rancho Sausal Redondo was a 22,458-acre (91 km2) Mexican land grant in present day Los Angeles County, California given in 1837 to Antonio Ygnacio Ávila by Juan Alvarado Governor of Alta California. Rancho Sausal Redondo covered the area that now includes Playa Del Rey, El Segundo, Manhattan Beach, Lawndale, Hermosa Beach, Inglewood, Hawthorne, and Redondo Beach.