Enrollment
1,499
California · 2024-25 NCES data
High school (grades 9-12) · San Lorenzo, CA
Arroyo High
Federal NCES profile for Arroyo High, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 35/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 063471005845
👥 S:T ratio 2
📚 AP courses 65
🌟 Gifted program 70
🎓 Counselors 0
📋 Attendance 39
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Arroyo High earns 35/100 on the Resource Investment Index, with class sizes larger than 76% of California schools.
- #3 of 4
- high schools in San Lorenzo · Resource Index
- 35
- Resource Index · Typical
- 24.6:1
- large classes for California
- 49.4%
- free-lunch eligible
Arroyo High has class sizes larger than 76% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Arroyo High ranks #3 of 4 high schools in San Lorenzo, CA.
School address
District: San Lorenzo Unified · California
NCES ID 063471005845 Verify on NCES CCD record →
Teachers (FTE)
61.0
Federal CCD staff survey
Students per teacher
24.6:1
vs 21.5:1 California avg
+14% vs state
Free-lunch eligible
49.4%
vs 55.5% California avg
-11% vs state
Student-teacher ratio in context
How Arroyo High compares with California and U.S. medians
What stands out at Arroyo High
Arroyo High is a large high school in San Lorenzo, California, enrolling 1,499 students.
Class loads run somewhat heavier than typical: 24.6:1 puts it in the larger third of California schools by student-teacher ratio.
Economic need runs somewhat below the state's typical profile, with 49.4% of students eligible for free meals.
By headcount it is one of the larger campuses in California, bigger than 94% of state schools at 1,499 students.
Its Resource Investment Index sits near the middle of the pack among 9,998 scored California schools.
Against 396 statewide peers matched on enrollment and economic need, it ranks mid-pack at #229.
Its student body is led by Hispanic or Latino (50%) and Asian (31%) (diversity index 65/100).
On the academic-pipeline side it reports 13 Advanced Placement courses.
Counselor access is stretched at roughly 508 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Attendance runs somewhat below the norm, with 24.3% of students chronically absent per the 2021-22 civil-rights collection.
Among San Lorenzo's high schools, it stands alongside San Lorenzo High (1,029 students): Arroyo High is larger than that campus by headcount and runs heavier classes (24.6:1 vs 20.6:1).
San Lorenzo Unified also operates San Lorenzo High (1,029 students) and Bohannon Middle (606 students) alongside Arroyo 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 Arroyo High compares
Arroyo 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 | 24.6:1 | ▲ 14% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 49.4% | ▼ 11% | 55.5% | 51.7% |
| Enrollment | 1,499 | top 6% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
24.6:1
Leaner classes than 6% of US schools, heavier class loads than most.
1,499
Bigger than 96% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
49.4%
free-lunch eligible
- 11% below the California average of 55.5%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
24.6:1
students per teacher
- 14% above state mean
Top 76% in California - lower ratio than 24% of state schools
Well above 20:1, one of the more stretched staffing loads nationally relative to enrollment.
Engagement
24.3%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$15,066
per pupil, district-wide
- below California avg of $16,509
Somewhat below the U.S. average per-pupil spend; funding constraints may affect programs, facilities, and staffing.
Support staff
Counselors3.0 FTE
Per 508 students, the combined health-and-guidance staffing load for this school.
Discipline context
0
in-school suspensions + 55 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 3.7 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
Hispanic or Latino 49.9%
Asian 30.9%
White 7.4%
African American 5.8%
Two or More 3.7%
Native Hawaiian / Pacific Islander 1.7%
American Indian / Alaska Native 0.5%
Largest group: Hispanic or Latino at 49.9% of enrollment.
Student-body diversity index 64.5/100
Simpson diversity index - at 64.5, Arroyo High is more mixed than the California school average of 46.0.
Programs
AP courses offered 13
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for San Lorenzo Unified, which includes Arroyo High.
$15,066
Per student
-9%
vs California
Avg $16,509
-9%
vs U.S.
Avg $16,593
Revenue mix
Local 36.5%
State 56.3%
Federal 7.1%
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 Arroyo High Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| San Lorenzo High | Smaller | Higher economic need | Lower S:T ratio |
| Bohannon Middle | Smaller | Higher economic need | Lower S:T ratio |
| Hesperian Elementary | Smaller | Higher economic need | Higher S:T ratio |
| Washington Manor Middle | Smaller | Similar economic need | Lower S:T ratio |
| Edendale Middle | Smaller | Higher economic need | Lower S:T ratio |
Comparisons are relative to Arroyo High's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,029
- Students per teacher
- 20.6:1
- Resource Index
- 34/100
- Enrollment
- 606
- Students per teacher
- 20.2:1
- Resource Index
- 32/100
- Enrollment
- 500
- Students per teacher
- 26.3:1
- Resource Index
- 17/100
- Enrollment
- 500
- Students per teacher
- 21.7:1
- Resource Index
- 34/100
- Enrollment
- 483
- Students per teacher
- 21:1
- Resource Index
- 22/100
Similar high schools in San Lorenzo
3 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 (~1,499 students)
Similar student-teacher ratio (~24.6:1)
Next steps
Verify locally before acting on Arroyo High's federal record.
- Compare Arroyo High against another school. Compare schools
- San Lorenzo Unified'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 Arroyo High
How many students attend Arroyo High?
Arroyo High has 1,499 students enrolled. It is a high school in San Lorenzo, CA.
What is the student-teacher ratio at Arroyo High?
The student-teacher ratio at Arroyo High is 24.6:1, which is 14% higher than the California average of 21.5:1 and 57% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Arroyo High?
49.4% of students at Arroyo High are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Arroyo High?
The largest demographic group at Arroyo High is Hispanic or Latino at 49.9% of enrollment, in San Lorenzo, CA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 64.5/100.
What is the Resource Investment Index for Arroyo High?
Arroyo High has a Resource Investment Index of 35/100 (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 Arroyo High rank among high schools in San Lorenzo?
By Resource Investment Index, Arroyo High ranks #3 of 4 high schools in San Lorenzo, 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 Lorenzo on the city page.
Is Arroyo High a good school?
Arroyo High earns 35/100 on the Resource Investment Index, with class sizes larger than 76% of California schools. 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 Lorenzo Unified?
Besides Arroyo High, San Lorenzo Unified also operates San Lorenzo High (1,029 students), Bohannon Middle (606 students), and Hesperian Elementary (500 students). See the San Lorenzo Unified 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.