Wilmington is not a neighborhood within the City of Los Angeles. It is an independent harbor district located in the southern portion of Los Angeles County, adjacent to the Port of Los Angeles.
Industrial, maritime, working-class. Home to the Port of Los Angeles (America's busiest container port), USS Iowa museum, Banning Museum (Phineas Banning, "Father of LA Harbor"), and a high concentration of logistics/warehousing. Significant Latino population (85%+).
So: Wilmington is in Los Angeles (the city), but not "in Los Angeles" in the colloquial sense of the central urban basin.