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Rancho San Antonio is a non-profit 501 (c) (3) organization. Rancho is a multi-service residential agency serving court-ordered adolescent boys. The primary goal of the agency is to utilize an inter-disciplinary approach to provide opportunity for rehabilitation of the total person through a balanced physical, social, spiritual, psychological, and educational experience.

The mission of Rancho San Antonio is to provide a caring and therapeutic environment where young men can successfully develop the skills, values, and personal responsibility needed to rejoin their family and the community.

Rancho San Antonio was founded in 1933 by the Catholic Big Brothers. Rancho started as a rented home in Redondo Beach to care for 18 boys. In June of 1938, Rancho San Antonio found its permanent home in Chatsworth, CA. In the 75 years since then, thousands of young men have turned to Rancho San Antonio for help and guidance. Since the 1950's, the Knights of Columbus have provided most of the fundraising for Rancho San Antonio. Within the first three years, they raised enough money to build the chapel, indoor swimming pool, and the first four dormitories on the grounds.

The Rancho campus sits on 19 acres, and with the continued support of the Knights of Columbus, today there are: eleven-living units, dinning hall, gymnasium, infirmary, recreation complex, football and baseball field, group home, career resource center, and administration building which currently provides service to 106 boys and their families.