Wilmington is a neighborhood in the Los Angeles Harbor Region area of Los Angeles, California, covering 9.14 square miles.Featuring a heavy concentration of industry and the third-largest oil field in the United States, it is considered sparsely populated in comparison with the city as a whole and within the city it is distinguished by its youthful population and high percentage of Latino and foreign-born residents.It is the site of Los Angeles Harbor College, Banning High School and ten other primary and secondary schools. Wilmington has six parks, including one on the waterfront.Wilmington dates its history back to a 1784 Spanish land grant. It became a separate city in 1863, and it joined the city of Los Angeles in 1909. Places of interest include the headquarters U.S. Army for Southern California and the Drum Barracks built to protect the nascent Los Angeles harbor during the American Civil War.