Diamond Bar High School (DBHS) opened in 1982 and is located in the city of Diamond Bar, California. The southern portion of the city is served by the Walnut Valley Unified School District , while the northern portion is served by the Pomona Unified School District . DBHS is one of two comprehensive high schools in the Walnut Valley Unified School District. The district also offers a continuation high school, three middle schools and nine elementary schools. DBHS serves approximately 3,000 students in grades 9-12.