- Enrollment
- 1,658
- Students per teacher
- 22.1:1
- Resource Index
- 33/100
High school (grades 9-12) · San Mateo, CA
Hillsdale High
Federal NCES profile for Hillsdale High, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 38/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 063498005923
👥 S:T ratio 31
🌟 Gifted program 30
🎓 Counselors 17
📋 Attendance 76
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Hillsdale High earns 38/100 on the Resource Investment Index, with class sizes smaller than 83% of California schools. It is also more racially and ethnically mixed than most California schools.
- #1 of 3
- high schools in San Mateo · Resource Index
- 38
- Resource Index · Typical
- 17.2:1
- small classes for California
- 16.8%
- free-lunch eligible
Hillsdale High has class sizes smaller than 83% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Hillsdale High ranks #1 of 3 high schools in San Mateo, CA.
School address
District: San Mateo Union High · California
NCES ID 063498005923 Verify on NCES CCD record →
CCD year-over-year · 2022-23 → 2023-24
-48 students YoY
Hillsdale High held near 1,581 students from 2022-23 to 2023-24 (-48 headcount).
Teacher FTE lost 92.7 → 86.5 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
-48 students YoY 063498005923 · San Mateo, CA High · MID · TRAD
1,585 enr · 17.2:1 · 16.8% lunch · RII 38
Nearest enrollment peer: Aragon High (1,658 students)
Hillsdale High held near 1,581 students from 2022-23 to 2023-24 (-48 headcount). Teacher FTE lost 92.7 → 86.5 across the same CCD years. Read with this school → · District book → · California schools → · Find another →
Hillsdale High in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Aragon High
Aragon High
1,658 students
- This school
Hillsdale High
1,585 students
- Burlingame Hig
Burlingame High
1,583 students
- San Mateo High
San Mateo High
1,557 students
- Mills High
Mills High
1,115 students
- Capuchino High
Capuchino High
1,061 students
What this shows Hillsdale High reports 1,585 students on the CCD universe file.
How Hillsdale High compares
Hillsdale High held steady on CCD headcount: ratios and free-lunch share vs California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 17.2:1 | ▼ 20% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 16.8% | ▼ 70% | 55.5% | 51.7% |
| Enrollment | 1,585 | top 6% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
17.2:1
Leaner classes than 29% of US schools, heavier class loads than most.
1,585
Bigger than 97% of US schools by enrollment, a large campus nationally.
Equity indicators methodology
Economic need
16.8%
free-lunch eligible
- 70% below the California average of 55.5%
Below the 40% Title I threshold, among the lower-need profiles in the state; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
17.2:1
students per teacher
- 20% below state mean
Top 17% in California - lower ratio than 83% of state schools
Between 16:1 and 20:1, squarely in the typical U.S. public-school staffing range.
Engagement
9.7%
chronically absent (missed 10%+ of school days)
In the 5-10% range, close to the pre-pandemic national baseline.
Funding equity
$24,423
per pupil, district-wide
- above California avg of $18,665
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors3.8 FTE
Per 417 students, the combined health-and-guidance staffing load for this school.
Discipline context
9
in-school suspensions + 44 out-of-school
Suspension rate: 0.6 per 100 students. Combined in-school and out-of-school rate: 3.3 per 100 students. Reported via the Civil Rights Data Collection.
Student demographics
Hispanic or Latino 37.8%
White 30.9%
Asian 19.8%
Two or More 9.4%
African American 1.0%
Native Hawaiian / Pacific Islander 1.0%
American Indian / Alaska Native 0.1%
Largest group: Hispanic or Latino at 37.8% of enrollment.
Student-body diversity index 71.3/100
Simpson diversity index - at 71.3, Hillsdale High is more mixed than the California school average of 46.0.
Programs
AP courses offered 17
District finance for San Mateo Union High reports $24,423 per pupil (NCES F-33) - open the district page for the full revenue mix.
How Hillsdale High Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Aragon High | Similar size | Similar economic need | Higher S:T ratio |
| Burlingame High | Similar size | Similar economic need | Higher S:T ratio |
| San Mateo High | Similar size | Similar economic need | Similar S:T ratio |
| Mills High | Smaller | Similar economic need | Higher S:T ratio |
| Capuchino High | Smaller | Similar economic need | Similar S:T ratio |
Comparisons are relative to Hillsdale High's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,583
- Students per teacher
- 22:1
- Resource Index
- 36/100
- Enrollment
- 1,557
- Students per teacher
- 18.5:1
- Resource Index
- 30/100
- Enrollment
- 1,115
- Students per teacher
- 21:1
- Resource Index
- 38/100
- Enrollment
- 1,061
- Students per teacher
- 17.4:1
- Resource Index
- 33/100
Similar high schools in San Mateo
2 comparable high schools (grades 9-12) serving the same city.
Nationwide high schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~1,585 students)
Similar student-teacher ratio (~17.2:1)
Frequently asked questions about Hillsdale High
How many students attend Hillsdale High?
Hillsdale High has 1,585 students enrolled. It is a high school in San Mateo, CA. CCD year-over-year: 1,629 (2022-23) → 1,581 (2023-24), nearly flat (-48).
What is the student-teacher ratio at Hillsdale High?
The student-teacher ratio at Hillsdale High is 17.2:1, which is 20% lower than the California average of 21.5:1 and 10% higher than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What percentage of students receive free lunch at Hillsdale High?
16.8% of students at Hillsdale High are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Hillsdale High?
The largest demographic group at Hillsdale High is Hispanic or Latino at 37.8% of enrollment, in San Mateo, CA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 71.3/100.
What is the Resource Investment Index for Hillsdale High?
Hillsdale High has a Resource Investment Index of 38/100 (typical reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, gifted-program reporting, counselor availability, chronic absenteeism. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Hillsdale High rank among high schools in San Mateo?
By Resource Investment Index, Hillsdale High ranks #1 of 3 high schools in San Mateo, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all high schools in San Mateo on the city page.
What other schools are in San Mateo Union High?
Besides Hillsdale High, San Mateo Union High also operates Aragon High (1,658 students), Burlingame High (1,583 students), and San Mateo High (1,557 students). See the San Mateo Union High district page for the complete list.