Anza is an unincorporated community located in southern Riverside County , California , United States , in the Anza Valley, a semi-arid region at a mean elevation of 1253 meters above sea level. It is located approximately 56 kilometers southwest of Palm Springs, 230 kilometers southeast of Los Angeles , California and approximately 120 kilometers northeast of San Diego , California , being traversed by State Route 371 . In local vernacular Anza, and several other mountain communities (including Garner Valley, Idyllwild, Pinyon Pines and Aguanga) are collectively referred to as "the Hill". As of the 2000 census, the unincorporated town of Anza had a total population of approximately 2100. [ citation needed ]