Excellent
#1651 of 9,539 schools in CA
Top 17% in state
Diamond Bar High
High School · Walnut Valley Unified
21400 Pathfinder Rd., Diamond Bar, CA 91765
Enrollment
2,532
Student-Teacher
25.6:1
Score
8.0
Grades
9th – 12th
Enrollment
2,532
Student-Teacher
25.6:1
Score
8.0
Grades
9th – 12th
Data vintage
2022-23
Data vintage2022-23
How this school compares
California schools
#1,651 of 9,539
In Diamond Bar
#5 of 10
public schools
In district
#8 of 15
Walnut Valley Unified
Equity
9.4 / 10
Excellent
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Diamond Bar High
High School in Diamond Bar · grades 9th – 12th. Start here, then compare fit against nearby and district options.
Evergreen Elementary
0.3 mi away. Use as a geographic alternative in the same move search.
Prestige Stem Academy
0.5 mi away. Use as a geographic alternative in the same move search.
About Diamond Bar High
Diamond Bar High is a public high school in Diamond Bar, CA, part of Walnut Valley Unified. Diamond Bar High serves approximately 2,532 students, and covers grades 9th-12th, and has a 25.6:1 student-teacher ratio. Diamond Bar High has a current MySchoolScout rating of 8.0 out of 10 and ranks #1,651 of 9,539 schools in CA.
Structured state assessment records for Diamond Bar High 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)
- This school 8.0 · Excellent
- District avg 7.3
- CA avg 6.5
What Parents Should Know
Diamond Bar High is a large school: 2,532 students. Size usually brings more course choices and activities than a smaller school can staff, but kids can also blend into the crowd. Ask how the school keeps students known and supported.
Diamond Bar High runs 25.6:1 students to teachers, above the national average. That often means bigger classes. Ask how the school supports kids who need extra help, and whether there are teaching assistants or small-group time.
Score Breakdown
Full Profile · 4/4 metricsView breakdown
View breakdown
View breakdown
View breakdown
Diamond Bar High — Students at Diamond Bar High score 72% proficient, which is above what's typical for similar communities (expected: 61%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
23.2%
Students qualifying for federal meal assistance
Test Scores CA CAASPP (2023-24)
Based on 30 test records from CA state assessments. About our data
Proficiency Trend
→ StableAverage proficiency (% at or above grade level) across Math & ELA over time.
* COVID-affected year — test participation was uneven nationwide. This data is weighted at 50% in the Growth score calculation.
Source: EdFacts (NCES) and state assessment data. Growth score: 7.6/10.
How Diamond Bar High Compares
See how Diamond Bar High performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Programs & Offerings
Data as of 2021-22 · Source: CRDC via Urban Institute · Learn more
Location
21400 Pathfinder Rd., Diamond Bar, CA 91765
Nearby Alternatives
Families considering Diamond Bar High may also want to explore other high schools in the area. Maple Hill Elementary (rated 8.6/10, 1.2 miles away), which scores slightly higher. Another option is Walnut Elementary (rated 8.5/10, 1.6 miles away, in nearby Walnut), which scores slightly higher. Additionally, Quail Summit Elementary (rated 8.5/10, 1.8 miles away), which scores slightly higher. For more schools in Diamond Bar, see our Diamond Bar schools guide .
Nearby Schools
20 within 2.1 mi| School | Distance | Rating |
|---|---|---|
| Evergreen Elementary Diamond Bar | 0.3 mi | 7.3 |
| Prestige STEM Academy Diamond Bar | 0.5 mi | — |
| Castle Rock Elementary Diamond Bar | 0.7 mi | 6.6 |
| South Pointe Middle Walnut | 0.9 mi | 8.4 |
| ST CHRISTOPHER-JOSEPH-AQUINAS ACADEMIC ACADEMY Diamond Bar | 1.0 mi | 5.2 |
| Institute of Knowledge Diamond Bar | 1.1 mi | — |
| Maple Hill Elementary Diamond Bar | 1.2 mi | 8.6 |
| Kingdom Seed Academy Diamond Bar | 1.3 mi | — |
| LANDMARK CHRISTIAN PRESCHOOL Diamond Bar | 1.4 mi | — |
| DISCOVERY WORLD MONTESSORI Walnut | 1.5 mi | — |
| Chaparral Middle Diamond Bar | 1.5 mi | 8.4 |
| Walnut Elementary Walnut | 1.6 mi | 8.5 |
| TZU CHI ELEMENTARY SCHOOL Walnut | 1.6 mi | 5.8 |
| TZU CHI ELEMENTARY SATOA Walnut | 1.7 mi | 6.1 |
| Quail Summit Elementary Diamond Bar | 1.8 mi | 8.5 |
| Ron Hockwalt Academies (Continuation) Walnut | 2.0 mi | 5.5 |
| Elite Open School Rowland Heights | 1.9 mi | — |
| ALLAIS SCHOOL Walnut | 2.3 mi | 6.5 |
| Ybarra Academy for the Arts and Technology Walnut | 2.0 mi | 6.5 |
| Shelyn Elementary Rowland Heights | 2.1 mi | 7.9 |
Neighborhood Census ACS (2019-2023)
Census data for ZIP 91765 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$104,737
Median Home Value
$878,900
Median Rent
$2,395/mo
Population
44,779
College Educated
53.3%
Homeownership
77.2%
Avg Commute
34 min
Poverty Rate
10.1%
Median Age
45.7
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| Arnold O. Beckman High Tustin, CA | 8.0 |
| California High Whittier, CA | 8.0 |
| Dana Hills High Dana Point, CA | 8.0 |
| Mark Keppel High Alhambra, CA | 8.0 |
| Mountain House High Mountain House, CA | 8.0 |
| Mt. Carmel High San Diego, CA | 8.0 |
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.
Neighborhood Context
Powered by 
Quick Facts NCES CCD (SY 2022-23)
- Grades
- 9th – 12th
- Enrollment
- 2,532
- Student-Teacher Ratio
- 25.6:1
- Teachers (FTE)
- 99
- Free/Reduced Lunch
- 23.2%
- 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%
Resources & Links
District
Walnut Valley Unified- District Enrollment
- 13,815
- Schools in District
- 15
- Per-Pupil Spending
- $13,971
- District Rank
- #8 of 15
Other Schools in This District
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