The zip codes for Wilmington are 90744 and 90748.
Wilmington is the site of Drum Barracks, aka Camp Drum, the only major American Civil War landmark in California.
The town was originally known as New San Pedro when it was founded in September 1858. It was located at the site of a wharf built by Phineas Banning, known as "Banning's Landing". The name was changed in 1863 in honor of Wilmington, Delaware, Banning's birthplace. A post office opened in 1864 was the second in Los Angeles County.
The first railroad in Southern California was built in 1869, and ran from Banning's Landing up to the city of Los Angeles.