Excellent
#1651 of 9,539 schools in CA
Top 17% in state
Diamond Bar High
High School · Walnut Valley Unified · Diamond Bar, CA
A Walnut Valley Unified high school where students score 11 points above what's typical for similar communities.
21400 Pathfinder Rd., Diamond Bar, CA 91765
- Math 67% vs CA 32% (2024)
- Reading 78% vs CA 52% (2024)
- 98.0% 4-year graduation
Academics
Full Profile · 4/4 metricsView breakdown
View breakdown
View breakdown
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Students at Diamond Bar High score 72% proficient, which is above what's typical for similar communities (expected: 61%).
2024 CAASPP proficiency
Most recent published year. School vs. CA average.
Trend
→ SteadyProficiency is down 14 points across the 16-year record (2009–2024) and has held near 72% recently.
Show all 14 years
Multi-year averages used by the rating model: math 77% (multi-year average, 2009-2024) · reading/ELA 79% (multi-year average, 2009-2024)
* COVID-affected year — test participation was uneven nationwide. This data is weighted at 50% in the Growth score calculation.
Based on 30 test records from CA state assessments and EdFacts (NCES).
Equity & diversity
Shown separately, not included in the overall scoreFree/reduced lunch
23.2%
Students qualifying for federal meal assistance
How we rate schools
A clear 1–10 score built from public data — growth, academics, and learning environment. No hidden criteria, no pay-to-play.
See how we rateThe neighborhood
Where Diamond Bar High sits, and what the surrounding area looks like.
Nearby same-level schools are colored by their score. Pins are locations, not attendance boundaries. Open the Los Angeles map →
Getting around & local context
- Walk 39Car-Dependent
- Bike 16Somewhat Bikeable
- City Safety: High1,946/100K
Powered by
FBI Uniform Crime Reporting · 2024 · city context (Diamond Bar), not school-level safety or attendance eligibility. Source details
Source period: 2024. Freshness not available.
Area profileU.S. Census ACS 5-year estimates (ACS 2019–2023 5-year estimates)
Median income
$104,737
Median home value
$878,900
Median rent
$2,395/mo
College educated
53.3%
Homeownership
77.2%
Poverty rate
10.1%
ACS 2019–2023 5-year estimates for the ZCTA associated with school ZIP 91765; this is area context, not an attendance boundary.
Programs & students
Programs & Offerings
Compare nearby
Nearby same-level schools
4 from a 5-mile search; district fallback available
| School | Score | Grades | Distance | Enrollment | Compare |
|---|---|---|---|---|---|
| Prestige Stem AcademyPrivate · tuition | Not rated | 3–12 | 0.5 mi | 6 | Compare → |
| Institute of KnowledgePrivate · tuition | Not rated | K–10 | 1.1 mi | 315 | Compare → |
| Elite Open SchoolPrivate · tuition | Not rated | 3–12 | 1.9 mi | 518 | Compare → |
| Ron Hockwalt Academies (continuation)Enrollment path unverified | 5.5 | 9–12 | 2.0 mi | 44 | Compare → |
Distance is proximity only; it is not attendance eligibility.
Private · tuition: Potential private option; tuition and admission requirements have not been verified.
Enrollment path unverified: Potential public school; its attendance or application path has not been classified.
Walnut Valley Unified
- Schools in district
- 15
- Rank in district
- #8 of 15
- District spending per student
- $13,971NCES F-33 · FY 2023 · This annual source is three years behind the current year.
- District child poverty rate
- 10.1%Census SAIPE · 2024
Diamond Bar High is listed in Walnut Valley Unified; a district label does not verify attendance for an address.
About Diamond Bar High
Diamond Bar High is a public high school in Diamond Bar, CA, part of Walnut Valley Unified, serving approximately 2,532 students in grades 9th-12th with a 25.6:1 student-teacher ratio. It holds a MySchoolScout rating of 8.0 out of 10 and ranks #1,651 of 9,539 schools in CA. State assessment records show 77% math proficiency (multi-year average, 2009-2024) and 79% reading/ELA proficiency (multi-year average, 2009-2024).
What's said publicly about Diamond Bar High
Synthesized from public, attributable sources. Updated April 2026.
Sources (1)
Frequently asked questions
Common questions about Diamond Bar High
What grades does Diamond Bar High serve?
Diamond Bar High serves students in grades 9th through 12th.
How many students attend Diamond Bar High?
Diamond Bar High has an enrollment of approximately 2,532 students.
What is the student-teacher ratio at Diamond Bar High?
The student-teacher ratio at Diamond Bar High is 25.6:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Diamond Bar High rank in CA?
Diamond Bar High ranks #1,651 of 9,539 schools in CA.
What is Diamond Bar High's MySchoolScout rating?
Diamond Bar High has a current MySchoolScout rating of 8.0 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.
What are the test scores at Diamond Bar High?
Based on loaded state assessment records, Diamond Bar High has 77% math proficiency (multi-year average, 2009-2024) and 79% reading/ELA proficiency (multi-year average, 2009-2024).
Is Diamond Bar High a charter school?
No, Diamond Bar High is not a charter school. It is a traditional public school operated by the local school district.
Is Diamond Bar High a Title I school?
No, Diamond Bar High is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Diamond Bar High?
23.2% of students at Diamond Bar High qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
School factsNCES Common Core of Data (CCD) (SY 2023–24)
- Grades
- 9th – 12th
- Enrollment
- 2,532
- Student-Teacher Ratio
- 25.6:1
- Teachers (FTE)
- 99
- Type
- regular
- Setting
- Large Suburb
- County
- Los Angeles County
- Chronic Absenteeism (SY 2022-23)
- 10.4%
- Phone
- (909) 594-1405
- 4-Year Graduation
- 98.0%
- Area population (ZIP 91765)
- 44,779
- Area average commute
- 34 min
- Area median age
- 45.7
Official sources & links
About this school's data
Every number on this page comes from a published source with a stated period. Where a source is partial, aging, or describes a surrounding area rather than the school, that limitation is named below.
- School directory (enrollment, grades, staff, contact)
- NCES Common Core of Data (CCD) · SY 2023–24 · Medium confidence
- Source period: SY 2023–24. A newer release may be available.
- MySchoolScout rating and rank
- MySchoolScout ranking model · Low confidence
- Vintage not available. Do not use this measure alone.
- Derived as a weighted blend of the component scores shown in Academics from state assessment, EdFacts growth, and NCES resource records.
- Math proficiency
- State department of education · 2024 CAASPP · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: 2024 CAASPP. A newer release may be available.
- Derived from source records rather than read directly from one field.
- Reading/ELA proficiency
- State department of education · 2024 CAASPP · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: 2024 CAASPP. A newer release may be available.
- Derived from source records rather than read directly from one field.
- Student progress (growth)
- NCES EdFacts · Mixed source periods · Low confidence
- Vintage not available. Do not use this measure alone.
- Available for part of the eligible units; results may not represent the full area.
- Derived as the fitted year-over-year slope of proficiency from multi-year assessment records.
- Neighborhood (income, housing, education)
- U.S. Census ACS 5-year estimates · ACS 2019–2023 5-year estimates · Low confidence
- Older source: ACS 2019–2023 5-year estimates. Use as historical context.
- Reported for the ZCTA for ZIP 91765; this does not measure the attendance area.
- Programs (AP/IB, athletics, gifted)
- CRDC via Urban Institute · SY 2021–22 · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: SY 2021–22. A newer release may be available.
Evidence periods: Rating mixed/unknown input periods; assessments multi-year average, 2009-2024; directory SY 2023–24
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