Castaic Union School District is a public school district serving unincorporated Castaic, portions of unincorporated Valencia, and a very small portion of the city of Santa Clarita within Los Angeles County, California, offering elementary and secondary instruction, grades pre-K through eighth.
"[2][3] A small portion of the district's boundaries reside within the city limits of Santa Clarita.
The vast majority of this area consists of commercial and industrial properties along with vacant parcels.
However, a very small area of residential and multi-family properties located near the intersection of Newhall Ranch Road and Copper Hill Drive are within the city limits of Santa Clarita, and lie within the boundary of the Castaic Union School District.
The Hart District offices are located thirteen miles southeast of the new Castaic High School site in the city of Santa Clarita.