Rancho Azusa de Dalton, (originally the Rancho El Susa), was a 4,431-acre (17.93 km2) Mexican land grant in present-day Los Angeles County, California, given in 1841 by Governor Juan Alvarado to Luis Arenas. Arenas sold his Rancho Azusa de Duarte holdings three years later to Henry Dalton (1803–1884), a wealthy merchant from Pueblo of Los Angeles. Dalton named his holding Rancho Azusa de Dalton. Henry Dalton was also called Don Enrique Dalton. Cities that have been established on the Rancho lands originally granted to Henry Dalton include Azusa, Arcadia, Monrovia, Irwindale and Baldwin Park.