Enrollment
493
California · 2024-25 NCES data
Elementary school (grades K-5) · Ontario, CA
Arroyo Elementary
Federal NCES profile for Arroyo Elementary, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 28/100.
2024-25 NCES dataElementary school (grades K-5)NCES 062847004387
👥 S:T ratio 6
🌟 Gifted program 70
🎓 Counselors 1
📋 Attendance 34
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Arroyo Elementary earns 28/100 on the Resource Investment Index, with class sizes near the California median. It is also less racially and ethnically mixed than most California schools.
- #12 of 26
- elementary schools in Ontario · Resource Index
- 28
- Resource Index · Lower
- 23.5:1
- students per teacher
- 67.0%
- free-lunch eligible
Arroyo Elementary has class sizes near the California median. Computed live against every California school reporting to NCES.
By Resource Investment Index, Arroyo Elementary ranks #12 of 26 elementary schools in Ontario, CA.
School address
District: Ontario-Montclair · California
NCES ID 062847004387 Verify on NCES CCD record →
Teachers (FTE)
21.0
Federal CCD staff survey
Students per teacher
23.5:1
vs 21.5:1 California avg
+9% vs state
Free-lunch eligible
67.0%
vs 55.5% California avg
+21% vs state
Student-teacher ratio in context
How Arroyo Elementary compares with California and U.S. medians
What stands out at Arroyo Elementary
Arroyo Elementary is a higher-need, mid-sized elementary school in Ontario, California, enrolling 493 students.
Class loads run somewhat heavier than typical: 23.5:1 puts it in the larger third of California schools by student-teacher ratio.
Economic need runs somewhat above the state's typical profile, with 67.0% of students eligible for free meals.
With 493 students, its enrollment sits close to the California median campus size.
Its Resource Investment Index sits near the middle of the pack among 9,998 scored California schools.
Against 2,081 statewide peers matched on enrollment and economic need, it ranks in the upper tier at #745.
Its student body is predominantly Hispanic or Latino (90% of enrollment), among the less diverse in the state (diversity index 19/100).
Counselor access is stretched at roughly 493 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Chronic absenteeism is elevated: 26.6% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
Among Ontario's elementary schools, it stands alongside Park View Elementary (844 students): Arroyo Elementary is smaller than that campus by headcount and runs leaner classes (23.5:1 vs 25.6:1).
Ontario-Montclair also operates Edison Elementary (736 students) and Central Language Academy (736 students) alongside Arroyo Elementary.
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 Elementary compares
Arroyo Elementary on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 23.5:1 | ▲ 9% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 67.0% | ▲ 21% | 55.5% | 51.7% |
| Enrollment | 493 | top 46% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
23.5:1
Leaner classes than 7% of US schools, heavier class loads than most.
493
Bigger than 61% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
67.0%
free-lunch eligible
- 21% above the California average of 55.5%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
23.5:1
students per teacher
- 9% above state mean
Top 67% in California - lower ratio than 33% of state schools
Above 20:1, running heavier than the typical U.S. public school; staffing is comparatively stretched.
Engagement
26.6%
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
$17,537
per pupil, district-wide
- above California avg of $16,509
Somewhat above the U.S. public-school average, reflecting higher local or state investment per enrolled student.
Support staff
Counselors1.0 FTE
Per 493 students, the combined health-and-guidance staffing load for this school.
Discipline context
0
in-school suspensions + 4 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 0.8 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 89.7%
White 3.2%
Asian 2.4%
African American 1.4%
Native Hawaiian / Pacific Islander 1.4%
American Indian / Alaska Native 1.2%
Two or More 0.6%
Largest group: Hispanic or Latino at 89.7% of enrollment.
Student-body diversity index 19.3/100
Simpson diversity index - at 19.3, Arroyo Elementary is less mixed than the California school average of 46.0.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Ontario-Montclair, which includes Arroyo Elementary.
$17,537
Per student
+6%
vs California
Avg $16,509
+6%
vs U.S.
Avg $16,593
Revenue mix
Local 11.5%
State 75.0%
Federal 13.5%
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 Elementary Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Edison Elementary | Larger | Lower economic need | Higher S:T ratio |
| Central Language Academy | Larger | Similar economic need | Higher S:T ratio |
| Ray Wiltsey Middle | Larger | Higher economic need | Lower S:T ratio |
| Oaks Middle | Larger | Similar economic need | Lower S:T ratio |
| Serrano Middle | Larger | Similar economic need | Lower S:T ratio |
Comparisons are relative to Arroyo Elementary's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 736
- Students per teacher
- 26.3:1
- Resource Index
- 48/100
- Enrollment
- 736
- Students per teacher
- 25.4:1
- Resource Index
- 27/100
- Enrollment
- 727
- Students per teacher
- 18.2:1
- Resource Index
- 36/100
- Enrollment
- 668
- Students per teacher
- 21.5:1
- Resource Index
- 21/100
- Enrollment
- 657
- Students per teacher
- 17.3:1
- Resource Index
- 34/100
Similar elementary schools in Ontario
6 comparable elementary schools (grades K-5) serving the same city.
Park View Elementary
Standard public school
844 students 25.6:1 students per teacher
Ranch View Elementary
Standard public school
738 students 30.8:1 students per teacher
Edison Elementary
Standard public school
736 students 26.3:1 students per teacher
Central Language Academy
Standard public school
736 students 25.4:1 students per teacher
Richard Haynes Elementary
Standard public school
641 students 21.4:1 students per teacher
Berlyn Elementary
Standard public school
639 students 22:1 students per teacher
Similar elementary 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 (~493 students)
Similar student-teacher ratio (~23.5:1)
Next steps
Verify locally before acting on Arroyo Elementary's federal record.
- Compare Arroyo Elementary against another school. Compare schools
- Ontario-Montclair'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 Elementary
How many students attend Arroyo Elementary?
Arroyo Elementary has 493 students enrolled. It is an elementary school in Ontario, CA.
What is the student-teacher ratio at Arroyo Elementary?
The student-teacher ratio at Arroyo Elementary is 23.5:1, which is 9% higher than the California average of 21.5:1 and 50% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Arroyo Elementary?
67.0% of students at Arroyo Elementary are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Arroyo Elementary?
The largest demographic group at Arroyo Elementary is Hispanic or Latino at 89.7% of enrollment, in Ontario, CA.
What is the Resource Investment Index for Arroyo Elementary?
Arroyo Elementary has a Resource Investment Index of 28/100 (lower reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Arroyo Elementary rank among elementary schools in Ontario?
By Resource Investment Index, Arroyo Elementary ranks #12 of 26 elementary schools in Ontario, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all elementary schools in Ontario on the city page.
Is Arroyo Elementary a good school?
Arroyo Elementary earns 28/100 on the Resource Investment Index, with class sizes near the California median. It is also less racially and ethnically mixed than most 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 Ontario-Montclair?
Besides Arroyo Elementary, Ontario-Montclair also operates Edison Elementary (736 students), Central Language Academy (736 students), and Ray Wiltsey Middle (727 students). See the Ontario-Montclair 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.