The William S. Hart Union High School District serves the City of Santa Clarita, California, grades 7-12. The total number of enrolled students is nearly 20,000. The superintendent of Hart School District is Robert Challinor. The District is named after William S. Hart, one of the first western film stars, who lived in Newhall and was a local benefactor. The region served by the WSHUHSD is also served by the Sulphur Springs, Saugus, Castaic, and Newhall elementary school districts.
Arroyo Seco
La Mesa
Placerita
Rancho Pico
Rio Norte
Sierra Vista
Castaic is K-8, all others are K-6