The Thacher School is a highly selective, co-educational, independent boarding school located on 427 acres (1.5 km²) of hillside overlooking the Ojai Valley in Ojai, California, United States. Founded in 1889 as a boys' school, it is now the oldest co-ed boarding school in California. Girls were first admitted in 1977. The first co-ed graduating class was the class of 1978. The student body numbers 235, and it boasts a 12% acceptance rate.