Our Lady of the Rosary Parish was founded in 1927 by Bishop John Cantwell of Los Angeles.

A rented house on Sierra Way initially served as a combination church and rectory.

In addition to their parish responsibilities the parish priests also served as the chaplains of St. Bernardine, County and the State hospital in Patton, as well as the Native American Reservation at Del Rosa and Masses at Lake Arrowhead in the summer.

On July 14, 1978 Pope Paul VI established the Diocese of San Bernardino.

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