Very Good
#2991 of 9,539 schools in CA
Top 31% in state
Hillsdale High
High School · San Mateo Union High · San Mateo, CA
A San Mateo Union High high school where students score 13 points below what's typical for similar communities.
3115 Del Monte St., San Mateo, CA 94403
- Math 37% vs CA 32% (2024)
- Reading 65% vs CA 52% (2024)
- 94.0% 4-year graduation
Academics
Full Profile · 4/4 metricsView breakdown
View breakdown
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Students at Hillsdale High score 51% proficient, which is below what's typical for similar communities (expected: 64%).
2024 CAASPP proficiency
Most recent published year. School vs. CA average.
Trend
↓ DecliningProficiency has fallen 11 points since 2017, to 51% in 2024, across a 16-year record (2009–2024).
Show all 12 years
Multi-year averages used by the rating model: math 57% (multi-year average, 2009-2024) · reading/ELA 70% (multi-year average, 2009-2024)
Based on 26 test records from CA state assessments and EdFacts (NCES).
Equity & diversity
Shown separately, not included in the overall scoreFree/reduced lunch
18.7%
Students qualifying for federal meal assistance
How we rate schools
A clear 1–10 score built from public data — growth, academics, and learning environment. No hidden criteria, no pay-to-play.
See how we rateThe neighborhood
Where Hillsdale High sits, and what the surrounding area looks like.
Nearby same-level schools are colored by their score. Pins are locations, not attendance boundaries. Open the San Francisco Bay Area map →
Getting around & local context
- Walk 49Car-Dependent
- Transit 37Some Transit
- Bike 49Somewhat Bikeable
- City Safety: High2,131/100K
Powered by
FBI Uniform Crime Reporting · 2024 · city context (San Mateo), not school-level safety or attendance eligibility. Source details
Source period: 2024. Freshness not available.
Area profileU.S. Census ACS 5-year estimates (ACS 2019–2023 5-year estimates)
Median income
$179,825
Median home value
$1,725,900
Median rent
$3,273/mo
College educated
60.3%
Homeownership
54%
Poverty rate
6.4%
ACS 2019–2023 5-year estimates for the ZCTA associated with school ZIP 94403; this is area context, not an attendance boundary.
Programs & students
Programs & Offerings
Compare nearby
Nearby same-level schools
4 from a 5-mile search; district fallback available
| School | Score | Grades | Distance | Enrollment | Compare |
|---|---|---|---|---|---|
| Junipero Serra High SchoolPrivate · tuition | 5.3 | 9–12 | 0.9 mi | 860 | Compare → |
| Compass High SchoolPrivate · tuition | Not rated | 9–12 | 1.0 mi | 24 | Compare → |
| Fusion Academy - San MateoPrivate · tuition | 7.2 | 6–12 | 1.0 mi | 71 | Compare → |
| Fusion Academy San MateoPrivate · tuition | Not rated | 6–12 | 1.0 mi | 29 | Compare → |
Distance is proximity only; it is not attendance eligibility.
Private · tuition: Potential private option; tuition and admission requirements have not been verified.
San Mateo Union High
- Schools in district
- 7
- Rank in district
- #5 of 7
- District spending per student
- $24,541NCES F-33 · FY 2023 · This annual source is three years behind the current year.
- District child poverty rate
- 6.0%Census SAIPE · 2024
Hillsdale High is listed in San Mateo Union High; a district label does not verify attendance for an address.
About Hillsdale High
Hillsdale High is a public high school in San Mateo, CA, part of San Mateo Union High, serving approximately 1,581 students in grades 9th-12th with a 18.4:1 student-teacher ratio. It holds a MySchoolScout rating of 7.3 out of 10 and ranks #2,991 of 9,539 schools in CA. State assessment records show 57% math proficiency (multi-year average, 2009-2024) and 70% reading/ELA proficiency (multi-year average, 2009-2024).
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.
School factsNCES Common Core of Data (CCD) (SY 2023–24)
- Grades
- 9th – 12th
- Enrollment
- 1,581
- Student-Teacher Ratio
- 18.4:1
- Teachers (FTE)
- 86
- 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%
- Area population (ZIP 94403)
- 43,459
- Area average commute
- 26.7 min
- Area median age
- 38.5
Official sources & links
About this school's data
Every number on this page comes from a published source with a stated period. Where a source is partial, aging, or describes a surrounding area rather than the school, that limitation is named below.
- School directory (enrollment, grades, staff, contact)
- NCES Common Core of Data (CCD) · SY 2023–24 · Medium confidence
- Source period: SY 2023–24. A newer release may be available.
- MySchoolScout rating and rank
- MySchoolScout ranking model · Low confidence
- Vintage not available. Do not use this measure alone.
- Derived as a weighted blend of the component scores shown in Academics from state assessment, EdFacts growth, and NCES resource records.
- Math proficiency
- State department of education · 2024 CAASPP · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: 2024 CAASPP. A newer release may be available.
- Derived from source records rather than read directly from one field.
- Reading/ELA proficiency
- State department of education · 2024 CAASPP · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: 2024 CAASPP. A newer release may be available.
- Derived from source records rather than read directly from one field.
- Student progress (growth)
- NCES EdFacts · Mixed source periods · Low confidence
- Vintage not available. Do not use this measure alone.
- Available for part of the eligible units; results may not represent the full area.
- Derived as the fitted year-over-year slope of proficiency from multi-year assessment records.
- Neighborhood (income, housing, education)
- U.S. Census ACS 5-year estimates · ACS 2019–2023 5-year estimates · Low confidence
- Older source: ACS 2019–2023 5-year estimates. Use as historical context.
- Reported for the ZCTA for ZIP 94403; this does not measure the attendance area.
- Programs (AP/IB, athletics, gifted)
- CRDC via Urban Institute · SY 2021–22 · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: SY 2021–22. A newer release may be available.
Evidence periods: Rating mixed/unknown input periods; assessments multi-year average, 2009-2024; directory SY 2023–24
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