Enrollment
537
California · 2024-25 NCES data
Elementary school (grades K-5) · Ontario, CA
Mariposa Elementary
Federal NCES profile for Mariposa Elementary, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 25/100.
2024-25 NCES dataElementary school (grades K-5)NCES 062847004406
👥 S:T ratio 17
🌟 Gifted program 70
🎓 Counselors 0
📋 Attendance 14
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mariposa Elementary earns 25/100 on the Resource Investment Index, with class sizes near the California median.
- #18 of 26
- elementary schools in Ontario · Resource Index
- 25
- Resource Index · Lower
- 20.7:1
- students per teacher
- 77.3%
- free-lunch eligible
Mariposa Elementary has class sizes near the California median. Computed live against every California school reporting to NCES.
By Resource Investment Index, Mariposa Elementary ranks #18 of 26 elementary schools in Ontario, CA.
School address
District: Ontario-Montclair · California
NCES ID 062847004406 Verify on NCES CCD record →
Teachers (FTE)
26.0
Federal CCD staff survey
Students per teacher
20.7:1
vs 21.5:1 California avg
-4% vs state
Free-lunch eligible
77.3%
vs 55.5% California avg
+39% vs state
Student-teacher ratio in context
How Mariposa Elementary compares with California and U.S. medians
What stands out at Mariposa Elementary
Mariposa Elementary is a high-poverty, mid-sized elementary school in Ontario, California, enrolling 537 students.
At 20.7:1, 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.
Economic need runs somewhat above the state's typical profile, with 77.3% of students eligible for free meals.
With 537 students, its enrollment sits close to the California median campus size.
Its Resource Investment Index lands in the lower third of 9,998 scored California schools.
Against 2,224 statewide peers matched on enrollment and economic need, it ranks mid-pack at #1,063.
Its student body is predominantly Hispanic or Latino (86% of enrollment) (diversity index 26/100).
Counselor access is stretched at roughly 537 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Chronic absenteeism is elevated: 34.3% 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): Mariposa Elementary is smaller than that campus by headcount and runs leaner classes (20.7:1 vs 25.6:1).
Ontario-Montclair also operates Edison Elementary (736 students) and Central Language Academy (736 students) alongside Mariposa 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 Mariposa Elementary compares
Mariposa 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 | 20.7:1 | ▼ 4% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 77.3% | ▲ 39% | 55.5% | 51.7% |
| Enrollment | 537 | top 40% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
20.7:1
Leaner classes than 14% of US schools, heavier class loads than most.
537
Bigger than 66% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
77.3%
free-lunch eligible
- 39% 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
20.7:1
students per teacher
- 4% below state mean
Top 41% in California - lower ratio than 59% of state schools
Above 20:1, running heavier than the typical U.S. public school; staffing is comparatively stretched.
Engagement
34.3%
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
$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 537 students, the combined health-and-guidance staffing load for this school.
Discipline context
0
in-school suspensions + 6 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 1.1 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 85.7%
African American 9.9%
White 2.0%
Asian 1.3%
Two or More 0.7%
American Indian / Alaska Native 0.4%
Largest group: Hispanic or Latino at 85.7% of enrollment.
Student-body diversity index 25.5/100
Simpson diversity index - at 25.5, Mariposa 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 Mariposa 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 Mariposa 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 | Lower economic need | Higher S:T ratio |
| Ray Wiltsey Middle | Larger | Similar economic need | Lower S:T ratio |
| Oaks Middle | Similar size | Lower economic need | Similar S:T ratio |
| Serrano Middle | Similar size | Similar economic need | Lower S:T ratio |
Comparisons are relative to Mariposa 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 (~537 students)
Similar student-teacher ratio (~20.7:1)
Next steps
Verify locally before acting on Mariposa Elementary's federal record.
- Compare Mariposa 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 Mariposa Elementary
How many students attend Mariposa Elementary?
Mariposa Elementary has 537 students enrolled. It is an elementary school in Ontario, CA.
What is the student-teacher ratio at Mariposa Elementary?
The student-teacher ratio at Mariposa Elementary is 20.7:1, which is 4% lower than the California average of 21.5:1 and 32% 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 Mariposa Elementary?
77.3% of students at Mariposa Elementary are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Mariposa Elementary?
The largest demographic group at Mariposa Elementary is Hispanic or Latino at 85.7% of enrollment, in Ontario, CA.
What is the Resource Investment Index for Mariposa Elementary?
Mariposa Elementary has a Resource Investment Index of 25/100 (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 Mariposa Elementary rank among elementary schools in Ontario?
By Resource Investment Index, Mariposa Elementary ranks #18 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 Mariposa Elementary a good school?
Mariposa Elementary earns 25/100 on the Resource Investment Index, with class sizes near the California median. 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 Mariposa 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.