Very Good
#2991 of 9,539 schools in CA
Top 31% in state
Hillsdale High
High School · San Mateo Union High
3115 Del Monte St., San Mateo, CA 94403
Enrollment
1,581
Student-Teacher
18.4:1
Score
7.3
Grades
9th – 12th
Enrollment
1,581
Student-Teacher
18.4:1
Score
7.3
Grades
9th – 12th
Data vintage
2022-23
Data vintage2022-23
How this school compares
California schools
#2,991 of 9,539
In San Mateo
#9 of 19
public schools
In district
#5 of 7
San Mateo Union High
School environment
9.6 / 10
Excellent
Shortlisting around Hillsdale High?
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Hillsdale High
High School in San Mateo · grades 9th – 12th. Start here, then compare fit against nearby and district options.
Abbott Middle
0.2 mi away. Use as a geographic alternative in the same move search.
Beresford Elementary
0.5 mi away. Use as a geographic alternative in the same move search.
About Hillsdale High
Hillsdale High is a public high school in San Mateo, CA, part of San Mateo Union High. Hillsdale High serves approximately 1,581 students, and covers grades 9th-12th, and has a 18.4:1 student-teacher ratio. Hillsdale High has a current MySchoolScout rating of 7.3 out of 10 and ranks #2,991 of 9,539 schools in CA.
Structured state assessment records for Hillsdale High show 57% math proficiency (multi-year average, 2009-2024) and 70% reading/ELA proficiency (multi-year average, 2009-2024).
- This school 7.3 · Very Good
- District avg 7.3
- CA avg 6.5
Score Breakdown
Full Profile · 4/4 metricsView breakdown
View breakdown
View breakdown
View breakdown
Hillsdale High — Students at Hillsdale High score 51% proficient, which is below what's typical for similar communities (expected: 64%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
18.7%
Students qualifying for federal meal assistance
Test Scores CA CAASPP (2023-24)
Based on 26 test records from CA state assessments. About our data
Proficiency Trend
↓ DecliningAverage proficiency (% at or above grade level) across Math & ELA over time.
Source: EdFacts (NCES) and state assessment data. Growth score: 6.7/10.
How Hillsdale High Compares
See how Hillsdale 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
3115 Del Monte St., San Mateo, CA 94403
Nearby Alternatives
Families considering Hillsdale High may also want to explore other high schools in the area. FUSION ACADEMY - SAN MATEO (rated 7.2/10, 1.0 miles away), with a very similar rating. Additionally, JUNIPERO SERRA HIGH SCHOOL (rated 5.3/10, 0.9 miles away), a more accessible option. For more schools in San Mateo, see our San Mateo schools guide .
Nearby Schools
20 within 1.3 mi| School | Distance | Rating |
|---|---|---|
| Abbott Middle San Mateo | 0.2 mi | 6.6 |
| Beresford Elementary San Mateo | 0.5 mi | 6.0 |
| Meadow Heights Elementary San Mateo | 0.5 mi | 5.8 |
| Laurel Elementary San Mateo | 0.5 mi | 2.9 |
| ST GREGORY SCHOOL San Mateo | 0.6 mi | 5.2 |
| St Gregory San Mateo | 0.6 mi | — |
| THE CAREY SCHOOL San Mateo | 0.9 mi | 8.7 |
| JUNIPERO SERRA HIGH SCHOOL San Mateo | 0.9 mi | 5.3 |
| COMPASS HIGH SCHOOL San Mateo | 1.0 mi | — |
| UP ACADEMY, INC. San Mateo | 1.0 mi | — |
| The Carey School San Mateo | 0.9 mi | — |
| The Burkard School San Mateo | 1.0 mi | — |
| UP ACADEMY San Mateo | 1.0 mi | — |
| Fusion Academy San Mateo San Mateo | 1.0 mi | — |
| THE BURKARD SCHOOL San Mateo | 1.0 mi | 5.4 |
| FUSION ACADEMY - SAN MATEO San Mateo | 1.0 mi | 7.2 |
| THE NUEVA SCHOOL San Mateo | 1.0 mi | 7.4 |
| Cipriani Elementary Belmont | 1.2 mi | 8.3 |
| SERENDIPITY SCHOOL Belmont | 1.3 mi | 8.3 |
| Serendipity School Belmont | 1.3 mi | — |
Neighborhood Census ACS (2019-2023)
Census data for ZIP 94403 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$179,825
Median Home Value
$1,725,900
Median Rent
$3,273/mo
Population
43,459
College Educated
60.3%
Homeownership
54%
Avg Commute
26.7 min
Poverty Rate
6.4%
Median Age
38.5
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| Archie Williams High San Anselmo, CA | 7.3 |
| Bellflower High Bellflower, CA | 7.3 |
| Brawley Union High Brawley, CA | 7.3 |
| Canyon High Anaheim, CA | 7.3 |
| El Cerrito High El Cerrito, CA | 7.3 |
| El Diamante High Visalia, CA | 7.3 |
Frequently Asked Questions
Common questions about Hillsdale High
What grades does Hillsdale High serve?
Hillsdale High serves students in grades 9th through 12th.
How many students attend Hillsdale High?
Hillsdale High has an enrollment of approximately 1,581 students.
What is the student-teacher ratio at Hillsdale High?
The student-teacher ratio at Hillsdale High is 18.4:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Hillsdale High rank in CA?
Hillsdale High ranks #2,991 of 9,539 schools in CA.
What is Hillsdale High's MySchoolScout rating?
Hillsdale High has a current MySchoolScout rating of 7.3 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 Hillsdale High?
Based on loaded state assessment records, Hillsdale High has 57% math proficiency (multi-year average, 2009-2024) and 70% reading/ELA proficiency (multi-year average, 2009-2024).
Is Hillsdale High a charter school?
No, Hillsdale High is not a charter school. It is a traditional public school operated by the local school district.
Is Hillsdale High a Title I school?
No, Hillsdale High is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Hillsdale High?
18.7% of students at Hillsdale 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
- 1,581
- Student-Teacher Ratio
- 18.4:1
- Teachers (FTE)
- 86
- Free/Reduced Lunch
- 18.7%
- Type
- regular
- Setting
- Midsize City
- County
- San Mateo County
- Chronic Absenteeism (SY 2022-23)
- 16.1%
- Phone
- (650) 558-2699
- 4-Year Graduation
- 94.0%
Resources & Links
District
San Mateo Union High- District Enrollment
- 8,841
- Schools in District
- 7
- Per-Pupil Spending
- $24,541
- District Rank
- #5 of 7
Other Schools in This District
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