La Jolla is a small neighborhood in Placentia, California, in northern Orange County.

Traditionally La Jolla has largely been made up of Hispanics, but does have Caucasian and a small portion of other races.

This small neighborhood was once known as La Jolla Colony, Placentia and was not considered part of unincorporated Anaheim.

La Jolla was severely damaged in the Orange County flood of 1938 which destroyed almost every structure in the area with the exception of McFadden School, a small church, and about 7 blocks of homes.

La Jolla is primarily a residential area made up of older single-family homes and several apartment complexes.