Enrollment
1,658
California · 2024-25 NCES data
High school (grades 9-12) · San Mateo, CA
Aragon High
Federal NCES profile for Aragon High, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 46/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 063498005919
👥 S:T ratio 12
📚 AP courses 100
🌟 Gifted program 30
🎓 Counselors 17
📋 Attendance 74
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Aragon High earns 46/100 on the Resource Investment Index, with class sizes near the California median. It is also one of the largest schools in California.
- #2 of 3
- high schools in San Mateo · Resource Index
- 46
- Resource Index · Typical
- 22.1:1
- students per teacher
- 13.6%
- free-lunch eligible
Aragon High has class sizes near the California median. Computed live against every California school reporting to NCES.
By Resource Investment Index, Aragon High ranks #2 of 3 high schools in San Mateo, CA.
School address
District: San Mateo Union High · California
NCES ID 063498005919 Verify on NCES CCD record →
Teachers (FTE)
75.0
Federal CCD staff survey
Students per teacher
22.1:1
vs 21.5:1 California avg
+3% vs state
Free-lunch eligible
13.6%
vs 55.5% California avg
-75% vs state
Student-teacher ratio in context
How Aragon High compares with California and U.S. medians
What stands out at Aragon High
Aragon High is a lower-poverty, large high school in San Mateo, California, enrolling 1,658 students.
At 22.1:1, its student-teacher ratio sits close to the California median, within a few percentage points of the 21.5:1 state norm, neither notably crowded nor notably small.
Comparatively few students face economic hardship here, 13.6% free-meal eligibility runs 75% below the California average.
By headcount it is one of the larger campuses in California, bigger than 95% of state schools at 1,658 students.
Its Resource Investment Index sits near the middle of the pack among 9,998 scored California schools.
Against 242 statewide peers matched on enrollment and economic need, it ranks mid-pack at #141.
Its student body is led by Asian (33%) and Hispanic or Latino (27%), more mixed than most schools in the state (diversity index 73/100).
On the academic-pipeline side it reports 20 Advanced Placement courses.
Counselor access is stretched at roughly 415 students per counselor, well above the ASCA-recommended 250:1 ceiling.
10.6% of students were chronically absent in the 2021-22 collection, in line with the post-pandemic national range.
The surrounding San Mateo Union High spends $22,262 per pupil, 35% above the California average, a better-resourced district than most.
Among San Mateo's high schools, it stands alongside Hillsdale High (1,585 students): Aragon High is larger than that campus by headcount and runs heavier classes (22.1:1 vs 17.2:1).
San Mateo Union High also operates Hillsdale High (1,585 students) and Burlingame High (1,583 students) alongside Aragon High.
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Aragon High compares
Aragon High on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 22.1:1 | ▲ 3% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 13.6% | ▼ 75% | 55.5% | 51.7% |
| Enrollment | 1,658 | top 5% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
22.1:1
Leaner classes than 10% of US schools, heavier class loads than most.
1,658
Bigger than 97% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
13.6%
free-lunch eligible
- 75% 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
22.1:1
students per teacher
- 3% above state mean
Top 54% in California - lower ratio than 46% of state schools
Above 20:1, running heavier than the typical U.S. public school; staffing is comparatively stretched.
Engagement
10.6%
chronically absent (missed 10%+ of school days)
In the 10-15% range, above the pre-pandemic national baseline but within the broader post-pandemic picture.
Funding equity
$22,262
per pupil, district-wide
- above California avg of $16,509
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors4.0 FTE
Per 415 students, the combined health-and-guidance staffing load for this school.
Discipline context
3
in-school suspensions + 25 out-of-school
Suspension rate: 0.2 per 100 students. Combined in-school and out-of-school rate: 1.7 per 100 students. Reported via the Civil Rights Data Collection.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
Asian 33.4%
Hispanic or Latino 27.2%
White 26.1%
Two or More 10.7%
Native Hawaiian / Pacific Islander 2.0%
African American 0.6%
Largest group: Asian at 33.4% of enrollment.
Student-body diversity index 73.4/100
Simpson diversity index - at 73.4, Aragon High is more mixed than the California school average of 46.0.
Programs
AP courses offered 20
Funding & spending
District-wide per-pupil expenditure for San Mateo Union High, which includes Aragon High.
$22,262
Per student
+35%
vs California
Avg $16,509
+34%
vs U.S.
Avg $16,593
Revenue mix
Local 85.1%
State 11.5%
Federal 3.4%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Aragon High Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Hillsdale High | Similar size | Similar economic need | Lower S:T ratio |
| Burlingame High | Similar size | Similar economic need | Similar S:T ratio |
| San Mateo High | Similar size | Higher economic need | Lower S:T ratio |
| Mills High | Smaller | Similar economic need | Similar S:T ratio |
| Capuchino High | Smaller | Higher economic need | Lower S:T ratio |
Comparisons are relative to Aragon High's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,585
- Students per teacher
- 17.2:1
- Resource Index
- 38/100
- 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.
Similar high schools statewide
Matched by enrollment size and by staffing ratio across all of California, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~1,658 students)
Similar student-teacher ratio (~22.1:1)
Next steps
Verify locally before acting on Aragon High's federal record.
- Compare Aragon High against another school. Compare schools
- San Mateo Union High's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Aragon High
How many students attend Aragon High?
Aragon High has 1,658 students enrolled. It is a high school in San Mateo, CA.
What is the student-teacher ratio at Aragon High?
The student-teacher ratio at Aragon High is 22.1:1, which is 3% higher than the California average of 21.5:1 and 41% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Aragon High?
13.6% of students at Aragon High are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Aragon High?
The largest demographic group at Aragon High is Asian at 33.4% of enrollment, in San Mateo, CA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 73.4/100.
What is the Resource Investment Index for Aragon High?
Aragon High has a Resource Investment Index of 46/100 (typical reported resources relative to schools nationally) based on 5 factors: student-teacher ratio, AP course offerings, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Aragon High rank among high schools in San Mateo?
By Resource Investment Index, Aragon High ranks #2 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.
Is Aragon High a good school?
Aragon High earns 46/100 on the Resource Investment Index, with class sizes near the California median. It is also one of the largest schools in California. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in San Mateo Union High?
Besides Aragon High, San Mateo Union High also operates Hillsdale High (1,585 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.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.