Wilmar was the former name of a then-unincorporated district of San Gabriel Township in the San Gabriel Valley, about eight miles east of the center of Los Angeles. In the 1940 census, Wilmar had a population of 11,590. Wilmar was combined with the unincorporated communities of Garvey and Potrero Heights to become the unincorporated community of South San Gabriel in the early 1950s.