San Dimas is a city in the San Gabriel Valley of Los Angeles County, California, with a population of 34,924 as of the 2020 census. Its name comes from San Dimas canyon in the nearby San Gabriel Mountains. The city is bordered by Glendora, Covina, La Verne, Pomona, Walnut, and several unincorporated communities.The area was originally inhabited by the Tongva people. European exploration began in 1774 with Juan Bautista de Anza. In 1837, the Rancho San José land grant was given to Ygnacio Palomares and Ricardo Vejar, who ran cattle, sheep, and crops. After a drought and land sales, the land eventually passed to Louis Phillips.
San Dimas developed rapidly after the arrival of the Los Angeles and San Gabriel Valley Railroad in 1887. It became an agricultural community known for wheat, citrus groves, and orange packing, with the Sunkist brand originating there. The town was renamed San Dimas and later incorporated as a city in 1960.Today, San Dimas is known for its Western art, small-town charm, equestrian culture, and community events like Western Days and rodeos. Key developments include the San Dimas Golf Course (1971), San Dimas Community Hospital (1972), and the San Dimas Swim and Racquet Club (1981).









