Very Good
#3404 of 9,533 schools in CA
Top 36% 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
7.0
Grades
9th – 12th
Enrollment
1,581
Student-Teacher
18.4:1
Score
7.0
Grades
9th – 12th
Updated
2022-23
Updated 2022-23
How this school compares
In San Mateo
#7 of 19
public schools
California high schools
#638 of 1,892
In district
#5 of 7
San Mateo Union High
School environment
9.3 / 10
Exceptional
About Hillsdale High
Hillsdale High serves 1,581 students in grades 9-12 in San Mateo, California, operating as a regular public school with 86 full-time equivalent teachers and an 18.4:1 student-teacher ratio. The school earns a solid 7.4 out of 10 rating from MySchoolScout and ranks in the 78th percentile statewide at #2126 out of 9566 California schools. Academically, Hillsdale High shows particular strength in English Language Arts, where 65% of students perform at proficient or above levels across grade levels.
Mathematics presents more of a growth opportunity, with 37% of students achieving proficiency or above. The school's overall academic score of 7.6 out of 10 reflects its commitment to student achievement while highlighting areas for continued development. The school draws from an affluent community in the 94403 ZIP code, where the median household income reaches $171,213 and home values average $1,681,500.
With 61% of local residents holding bachelor's degrees or higher and a low 6.1% poverty rate, Hillsdale High serves families in a highly educated, economically stable area. Located on Del Monte Street in this mid-size city, the school benefits from San Mateo's blend of suburban comfort and proximity to Silicon Valley opportunities.
Score Breakdown
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Hillsdale High — Students at Hillsdale High score 51% proficient, which is below what's typical for similar communities (expected: 65%).
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 6 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: 4.2/10.
How Hillsdale High Compares
See how Hillsdale High performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Performance Trends
Math proficiency has declined from 50% (2019) to 37.23% (2024). Reading/ELA proficiency has declined from 71% (2019) to 64.95% (2024).
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 | 6.9 |
| Beresford Elementary San Mateo | 0.5 mi | 6.7 |
| Meadow Heights Elementary San Mateo | 0.5 mi | 5.2 |
| Laurel Elementary San Mateo | 0.5 mi | 3.6 |
| 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 | 8.0 |
| 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
Community Profile
The community surrounding Hillsdale High has a median household income of $179,825. It is a well-educated community where 60% of adults hold a bachelor's degree or higher. The median home value in the area is $1,725,900, with a median rent of $3,273/month. The local poverty rate of 6.4% is relatively low. The average commute for residents is 27 minutes. Source: U.S. Census ACS 2022 5-Year Estimates.
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| Andrew P. Hill High San Jose, CA | 7.0 |
| Antelope Valley High Lancaster, CA | 7.0 |
| Arroyo High San Lorenzo, CA | 7.0 |
| Atascadero High Atascadero, CA | 7.0 |
| Bell Gardens High Bell Gardens, CA | 7.0 |
| El Monte High El Monte, CA | 7.0 |
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 is ranked #3404 out of 9,533 schools in CA.
What is Hillsdale High's MySchoolScout rating?
Hillsdale High has a composite rating of 7.0 out of 10 on MySchoolScout. This score combines academic performance, student growth, and school environment into a single score. Equity data is shown separately for context.
What are the test scores at Hillsdale High?
Based on the most recent state assessment data, Hillsdale High has 41.5% math proficiency and 67.0% reading/ELA proficiency.
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.
Explore More Schools
Neighborhood Context
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
- Phone
- (650) 558-2699
- Data Year
- 2023–2024
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
How We Rate Schools
Every school receives a composite score from 1 to 10 based on four pillars: Academic Performance (50%), Student Growth (20%), Equity (15%), and Learning Environment (15%). Scores are built from publicly available data including standardized test results, enrollment figures, and school climate indicators.
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