Vista High School is a public high school in Vista, California, United States. Vista is located in North San Diego County. The Vista Unified School District encompasses a large geographic area. As such, it serves the needs of students from the cities of Vista, Bonsall, San Marcos, Oceanside, and Carlsbad. Vista High School is one of the largest schools in California, holding over 3,000 students, though its current campus was originally built in 1972 to educate 1,200 students. It was first established in 1936.