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Honest take: what's the hardest part about being a student at Diamond Bar High?
Community prompt from u/allk12. Replies below.
Enrollment
2,563
High
DISTRICT 1,582 · STATE 838
SCHOOL COMMUNITY·WALNUT VALLEY UNIFIED·NCES 064128007894
Diamond Bar High
21400 Pathfinder Rd., Diamond Bar, CA 91765 · (909) 594-1405 · Los Angeles County
GRADES 09–12HIGH21-SUBURBREGULAR SCHOOL2,563 STUDENTS
A-
allk12 Grade
Scored higher than 84% of California public high schools
- ATest scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
- B+Beats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
- C-Three-year trend Change in reading and math proficiency over the last three test years.
Grades compare a school only with schools in the same state, because every state gives its own test. How grades work · Top-graded California public high schools
Student : Teacher
26.0:1
99 FTE teachers
DISTRICT 18.1:1 · STATE 18.2:1
Free / Reduced Lunch
23%
579 students
DISTRICT 26% · STATE 65%
Community
6
0 members
Enrollment and student:teacher ratio compared against other high schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Grade 9 | 646 | 25% |
| Grade 10 | 626 | 24% |
| Grade 11 | 644 | 25% |
| Grade 12 | 647 | 25% |
Student demographics
45%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 46% · STATE 62% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
Test scores
CAASPP 2024-25 . % met or exceeded standardEnglish Language Arts
76.3%
CA avg 49.1% . -0.7pp since 2014
Math
68.3%
CA avg 37.7% . -4.7pp since 2014
What this means: On the CAASPP, California's statewide test, about 76 of every 100 students at this school read and write at grade level and about 68 of 100 do math at grade level. Across all California schools, those numbers are about 49 and 38. Reading and writing scores have held steady since 2014, while math scores are down about 5 points.
Performance levels, 2024-25
| Subject | Standard Exceeded | Standard Met | Standard Nearly Met | Standard Not Met |
|---|---|---|---|---|
| English Language Arts | 48.5% | 27.8% | 12.8% | 10.9% |
| Math | 44.0% | 24.3% | 15.6% | 16.1% |
Share of tested students at each CAASPP level. Each student counts in one level, so a row adds to about 100%.
CAASPP results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 76.3% | 68.3% |
| 2023-24 | 78.0% | 66.7% |
| 2022-23 | 79.3% | 68.1% |
| 2021-22 | 78.4% | 69.9% |
| 2020-21 | 79.2% | 77.3% |
| 2018-19 | 80.4% | 72.9% |
| 2017-18 | 74.2% | 68.9% |
| 2016-17 | 78.7% | 74.7% |
| 2015-16 | 69.0% | 70.0% |
| 2014-15 | 77.0% | 73.0% |
% met or exceeded standard, all students and all tested grades.
Source: CAASPP. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
72.3%
composite math + reading, all grades
Predicted
66.3%
based on CA schools with similar FRL share
Beats by
+6.0pp
above demographic expectation
What this means: About 72% of students here test proficient in math and reading, compared with the roughly 66% typical for California schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among California's top nor bottom 10%.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
Schools most like Diamond Bar High
Diamond Bar High's state test result (72.3% proficient) is higher than 2 of the 5 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Diamond Bar High this school | 2,563 | 22.6% | 72.3% |
| Evergreen Valley High San Jose | 2,703 | 22.4% | 75.2% |
| American High Fremont | 2,618 | 24.9% | 80.2% |
| Arcadia High Arcadia | 2,939 | 25.5% | 64.5% |
| Irvington High Fremont | 2,157 | 24.7% | 78.8% |
| Northwood High Irvine | 2,244 | 18.8% | 72.3% |
Matched among California high schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.
Where Diamond Bar High ranks
Among high schools| Measure | This school | In California | In Los Angeles County |
|---|---|---|---|
| State test proficiency ranked highest first | 72.3% | #70 of 1,052 | #16 of 228 |
| Math proficiency ranked highest first | 68.3% | #52 of 1,056 ▼ 8 | #11 of 229 ▼ 2 |
| Reading proficiency ranked highest first | 76.3% | #142 of 1,056 ▼ 25 | #34 of 229 ▼ 4 |
| 3-year test score change ranked biggest drop first | -1.8pp | #266 of 1,044 | #27 of 229 |
| Enrollment ranked largest first | 2,563 | #87 of 2,093 | #21 of 486 |
| Students per teacher ranked fewest first | 26.0:1 | #1,273 of 1,352 | #339 of 358 |
| Diversity index ranked most diverse first | 44.9% | #767 of 1,351 | #135 of 359 |
| Free and reduced lunch ranked highest share first | 22.6% | #1,463 of 1,575 | #374 of 396 |
| Enrollment change since 2017-18 ranked steepest decline first | -12.2% | #389 of 802 | #145 of 227 |
Ranked against other public high schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
2,563
+19 (+1%) vs 2020
+16% since 1990-91, when it was 2,219
Student : Teacher
26.0:1
was 25.7:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 2,563 | 98.6 | 26.0:1 | 23% (579) |
| 2023-24 | 2,532 | 99.5 | 25.4:1 | 23% (587) |
| 2022-23 | 2,557 | 96.3 | 26.6:1 | 23% (582) |
| 2020-21 | 2,544 | 99 | 25.7:1 | 20% (514) |
| 2017-18 | 2,918 | 113.2 | 25.8:1 | 19% (559) |
| 2015-16 | 3,061 | 113 | 27.1:1 | 10% (316) |
| 2010-11 | 3,119 | N/A | N/A | 8% (245) |
| 2000-01 | 2,897 | 115 | 25.2:1 | 3% (88) |
| 1990-91 | 2,219 | 79 | 28.1:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for Diamond Bar High.
Since 2017-18: students down 12% (2,918 to 2,563); teachers down 13% (113.2 to 98.6).
About Diamond Bar High
Diamond Bar High is a large high school based in Diamond Bar, California. The school serves grades 9 through 12. Enrollment is 2,563 students. High schools in California have about 838 students on average; enrollment here is 206% higher.
In Walnut Valley Unified, 15 schools enroll a combined 13,992 students.
More than half of the students at Diamond Bar High are Asian (72%). Beyond that, enrollment is 17% Hispanic, 5% White, and 4% multiracial. In Los Angeles County overall, about 15% of residents are Asian. On the diversity index, which measures the chance that two random students are from different groups, Diamond Bar High scores 45%.
Diamond Bar High reports a ratio of 26.0 students per teacher, from 98.6 full-time-equivalent teachers. The school's 26.0:1 compares with an average of 18.2:1 for high schools in California. Lunch program data show 23% of students are eligible for free or reduced-price meals. That is 47 points below the 70% average for public schools in Los Angeles County.
Diamond Bar High holds an A- allk12 Grade, placing it above 84% of California public high schools.
On BeatsExpectations, Diamond Bar High is 6.0 points above its prediction, a result in the middle 80% of California schools.
In Los Angeles County, where the school is located, the median household earns about $90,112 a year, 36% of adults hold a bachelor's degree or higher, and about 10% of people live in poverty. Counting Diamond Bar High, Los Angeles County has 2,244 public schools.
Evergreen Elementary is about 0.3 miles from Diamond Bar High, the shortest distance to any other public school. Other public schools within five miles: at least 8. The school's 72.3% average proficiency ranks 7th among 9 nearby schools.
Diamond Bar High has an NCES locale of Suburb: Large.
From 2020-21 to 2024-25, enrollment held near 2,563, starting from 2,544.
The Diamond Bar High discussion page is a place for special education services, counseling, and support programs. Teachers and staff are welcome to share updates too.
Los Angeles County at a glance
View full county profilePopulation
9,808,667
Census ACS
Median income
$90,112
Household, ACS
Bachelor's+
36%
Adults 25+
Poverty rate
10%
Below federal line
Schools in county
2,244
1,265,907 students
Quick facts
Related schools
Other schools in Walnut Valley Unified
- Walnut HighHigh · 2,148 students
- Chaparral MiddleMiddle · 1,349 students
- Suzanne MiddleMiddle · 1,190 students
- South Pointe MiddleMiddle · 979 students
- Evergreen ElementaryElementary · 709 students
- Walnut ElementaryElementary · 706 students
Other schools in Diamond Bar
- Chaparral MiddleMiddle · 1,349 students
- Evergreen ElementaryElementary · 709 students
- Quail Summit ElementaryElementary · 696 students
- Lorbeer MiddleMiddle · 688 students
- Castle Rock ElementaryElementary · 684 students
- Maple Hill ElementaryElementary · 556 students
Nearby schools
- Evergreen Elementary0.3 mi · 709
- Castle Rock Elementary0.8 mi · 684
- South Pointe Middle0.9 mi · 979
- Maple Hill Elementary1.2 mi · 556
- Chaparral Middle1.5 mi · 1,349
- Walnut Elementary1.6 mi · 706
Frequently asked questions
About Diamond Bar HighHow large is Diamond Bar High?
Diamond Bar High enrolls approximately 2,563 students in grades 09-12.
What age range does Diamond Bar High serve?
Diamond Bar High serves students from grade 09 through grade 12.
How many students per teacher at Diamond Bar High?
Approximately 26.0:1 students per teacher at Diamond Bar High.
What is the student diversity at Diamond Bar High?
Student demographics at Diamond Bar High are roughly 5% White, 17% Hispanic, 1% Black, 72% Asian, 4% Two or more.
Who oversees Diamond Bar High?
Diamond Bar High is overseen by Walnut Valley Unified in Los Angeles County.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.