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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

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

Full Profile · 4/4 metrics
Student Progress4.2Below Average25%
Year-over-year improvement in student test scores.
View breakdown
Years of Data2
Annual Change-1.88 pts/yr
Data Period2019–2024
TrendDeclining
Academics6.5Above Average25%
Student proficiency on state tests, adjusted for community poverty levels.
View breakdown
Math Proficiency37.2%
Reading/ELA Proficiency65%
Math vs. State Avg+9.2 pts
Reading vs. State Avg+9.1 pts
Overall Proficiency51%
Expected (poverty-adj.)65%
vs. Expected-13.7 pts
Adjusted Percentile50th
College Readiness8.1Excellent30%
Graduation rates, AP course participation, and IB availability.
View breakdown
AP Participation20.1%
IB ProgramNo
Resources & Environment9.3Exceptional20%
Student-teacher ratio, per-pupil spending, and attendance.
View breakdown
Student-Teacher Ratio18.4:1
Per-Pupil Spending$22,353

Hillsdale High — Students at Hillsdale High score 51% proficient, which is below what's typical for similar communities (expected: 65%).

How we calculate scores →

Equity & Diversity

Shown separately, not included in overall score

Free/Reduced Lunch

18.7%

Students qualifying for federal meal assistance

Test Scores CA CAASPP (2023-24)

Math Proficiency 41.5%
School
State
31.8%
ELA Proficiency 67.0%
School
State
51.5%

Based on 6 test records from CA state assessments. About our data

Proficiency Trend

↓ Declining

Average proficiency (% at or above grade level) across Math & ELA over time.

2019
Math
50%
ELA
71%
2024
Math
37.2%
ELA
65%

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.

Overall Score
7.0/10
64th percentile in CA
Academic
6.5/10
6.5/10
Growth
4.2/10
Below average
Environment
9.3/10
Above average

Funding & Resources

Free/Reduced Lunch
Students eligible for subsidized meals
19%
Teaching Staff
18:1 student-teacher ratio
86 teachers

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.

11 schools nearby View map →

Neighborhood Context

Walk Score
49 Car-Dependent
Transit Score
37 Some Transit
Bike Score
49 Somewhat Bikeable
City Safety
High (2,131/100K)

Powered by Walk Score

FBI UCR 2024. City-level (San Mateo). Data >1 year old.

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
Data Year
2023–2024

District

San Mateo Union High
District Enrollment
8,841
Schools in District
7
Per-Pupil Spending
$24,541
District Rank
#5 of 7

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.

Read our full methodology

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