Los Alamitos (Spanish for '"The Little Cottonwoods"') is a city in Orange County, California. The city was incorporated in March 1960. The population was 11,449 at the 2010 census, down from 11,536 at the 2000 census. The adjacent unincorporated community of Rossmoor uses Los Alamitos in its mailing address, but is not part of the city. The Los Alamitos Race Course is named for the city, but lies in the neighboring city of Cypress.
The USA Water Polo National Aquatic Center is located on the Joint Forces Training Base - Los Alamitos.
The history of the area during the Californio period and after U.S. annexation is detailed in the article on Rancho Los Alamitos. The town of Los Alamitos was established in 1896 by Lewellyn Bixby to support the new sugar beet factory in town built by the extremely wealthy Clark Brothers. William Andrews Clark, a future Senator from Montana, had built his fortune in mining, banking and logging in that state. His younger brother, J. Ross Clark, managed their operations in California after he moved to that state for health reasons. Lewellyn Bixby, whose family owned the surrounding land on the Rancho Los Cerritos and Rancho Los Alamitos, had been trying to build a sugar beet factory in that area for a few years but, due to financial losses in the 1880s, he no longer had the financial capital to undertake the sugar beet factory complex on his own.