Diamond Bar High
Diamond Bar, CA · High School · Grades 9-12
Diamond Bar High is a high school in Diamond Bar, CA with 2,557 students enrolled and a 65% proficiency rate. Part of Walnut Valley Unified. NCES data from the U.S. Department of Education.
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About This School
Diamond Bar High is a high school located in Diamond Bar, California. The school serves 2,557 students in grades 9-12. The student-to-teacher ratio is 26.6:1.
According to EDFacts assessment data, 65% of students meet grade-level proficiency standards in combined math and reading. The school reports a 76% graduation rate.
23% of students qualify for free or reduced-price lunch.
Diamond Bar High is part of the Walnut Valley Unified in California.
How This School Compares
Diamond Bar High has 2,557 students enrolled, making it larger than the average school in Walnut Valley Unified (899 students). Its 65% proficiency rate is 5 percentage points above the district average of 60%. Compared to the California state average of 45%, the school performs 20 points higher. The 26.6:1 student-teacher ratio is above the national average of 16:1.
Frequently Asked Questions
Diamond Bar High has 2,557 students enrolled in grades 9-12. The student-to-teacher ratio is 26.6:1.
According to EDFacts data, 65% of students at Diamond Bar High meet grade-level proficiency standards in combined math and reading assessments.
Diamond Bar High has a 76% graduation rate, measuring the percentage of students who graduate within four years.
Diamond Bar High is part of the Walnut Valley Unified in Diamond Bar, California. You can view all schools in this district on the district page.
All data on this page comes from the National Center for Education Statistics (NCES) Common Core of Data and EDFacts assessment results. These are official federal datasets published by the U.S. Department of Education.
School profiles are built from NCES directory data and EDFacts assessment results. Proficiency rates reflect combined math and reading performance. Graduation rates are reported for high schools with available data.
For this entity, the underlying data on this page comes from NCES Common Core of Data and EDFacts. The breakdown above is the federal record; the paragraphs below add the per-entity context that makes the headline numbers usable for a real decision rather than just a data lookup.
Every number on this page links back to NCES Common Core of Data and EDFacts; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within U.S. public schools and districts with similar size, similar exposure, or similar geography — not the national-level summary alone.
Source: NCES Common Core of Data, 2026.