Enrollment
499
California · 2024-25 NCES data
Elementary school (grades K-5) · Oxnard, CA
Rio Del Mar
Federal NCES profile for Rio Del Mar, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 30/100.
2024-25 NCES dataElementary school (grades K-5)NCES 063276011833
👥 S:T ratio 0
🌟 Gifted program 70
🎓 Counselors 0
📋 Attendance 48
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Rio Del Mar earns 30/100 on the Resource Investment Index, with class sizes larger than 97% of California schools.
- #7 of 32
- elementary schools in Oxnard · Resource Index
- 30
- Resource Index · Lower
- 31.2:1
- large classes for California
- 45.2%
- free-lunch eligible
Rio Del Mar has class sizes larger than 97% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Rio Del Mar ranks #7 of 32 elementary schools in Oxnard, CA.
School address
District: Rio Elementary · California
NCES ID 063276011833 Verify on NCES CCD record →
Teachers (FTE)
16.0
Federal CCD staff survey
Students per teacher
31.2:1
vs 21.5:1 California avg
+45% vs state
Free-lunch eligible
45.2%
vs 55.5% California avg
-19% vs state
Student-teacher ratio in context
How Rio Del Mar compares with California and U.S. medians
What stands out at Rio Del Mar
Rio Del Mar is a mid-sized elementary school in Oxnard, California, enrolling 499 students.
Class loads run heavy: 31.2:1 is larger than about 97% of California schools and 45% above the 21.5:1 state mean, so each teacher carries more students than is typical.
Economic need runs somewhat below the state's typical profile, with 45.2% of students eligible for free meals.
With 499 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 1,370 statewide peers matched on enrollment and economic need, it ranks in the upper tier at #538.
Its student body is predominantly Hispanic or Latino (84% of enrollment) (diversity index 29/100).
Counselor access is stretched at roughly 499 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Attendance runs somewhat below the norm, with 20.8% of students chronically absent per the 2021-22 civil-rights collection.
Among Oxnard's elementary schools, it stands alongside Juan Lagunas Soria Elementary (895 students): Rio Del Mar is smaller than that campus by headcount and runs heavier classes (31.2:1 vs 22.9:1).
Rio Elementary also operates Rio Del Sol (839 students) and Rio Real Elementary (794 students) alongside Rio Del Mar.
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 Rio Del Mar compares
Rio Del Mar on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 31.2:1 | ▲ 45% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 45.2% | ▼ 19% | 55.5% | 51.7% |
| Enrollment | 499 | top 45% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
31.2:1
Leaner classes than 2% of US schools, heavier class loads than most.
499
Bigger than 62% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
45.2%
free-lunch eligible
- 19% 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
31.2:1
students per teacher
- 45% above state mean
Top 97% in California - lower ratio than 3% of state schools
Well above 20:1, one of the more stretched staffing loads nationally relative to enrollment.
Engagement
20.8%
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
$15,938
per pupil, district-wide
- below California avg of $16,509
Close to the U.S. public-school average per-pupil spend.
Support staff
Counselors1.0 FTE
Per 499 students, the combined health-and-guidance staffing load for this school.
Discipline context
0
in-school suspensions + 2 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 0.4 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 83.8%
White 6.0%
Asian 4.4%
Two or More 3.2%
African American 2.0%
Native Hawaiian / Pacific Islander 0.6%
Largest group: Hispanic or Latino at 83.8% of enrollment.
Student-body diversity index 29.1/100
Simpson diversity index - at 29.1, Rio Del Mar is less mixed than the California school average of 46.0.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Rio Elementary, which includes Rio Del Mar.
$15,938
Per student
-3%
vs California
Avg $16,509
-4%
vs U.S.
Avg $16,593
Revenue mix
Local 32.2%
State 57.4%
Federal 10.3%
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 Rio Del Mar Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Rio Del Sol | Larger | Lower economic need | Lower S:T ratio |
| Rio Real Elementary | Larger | Higher economic need | Lower S:T ratio |
| Rio Vista Middle | Larger | Similar economic need | Lower S:T ratio |
| Rio Del Valle Middle | Similar size | Higher economic need | Lower S:T ratio |
| Rio Rosales | Similar size | Similar economic need | Lower S:T ratio |
Comparisons are relative to Rio Del Mar's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 839
- Students per teacher
- 25.4:1
- Resource Index
- 30/100
- Enrollment
- 794
- Students per teacher
- 24.8:1
- Resource Index
- 30/100
- Enrollment
- 637
- Students per teacher
- 19.9:1
- Resource Index
- 29/100
- Enrollment
- 569
- Students per teacher
- 17.2:1
- Resource Index
- 35/100
- Enrollment
- 557
- Students per teacher
- 24.2:1
- Resource Index
- 11/100
Similar elementary schools in Oxnard
6 comparable elementary schools (grades K-5) serving the same city.
Juan Lagunas Soria Elementary
Standard public school
895 students 22.9:1 students per teacher
Driffill Elementary
Standard public school
891 students 17.5:1 students per teacher
Kamala Elementary
Standard public school
842 students 20.5:1 students per teacher
Rio Del Sol
Standard public school
839 students 25.4:1 students per teacher
Curren Elementary
Standard public school
817 students 18.2:1 students per teacher
Lemonwood Elementary
Standard public school
808 students 18.4:1 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 (~499 students)
Similar student-teacher ratio (~31.2:1)
Next steps
Verify locally before acting on Rio Del Mar's federal record.
- Compare Rio Del Mar against another school. Compare schools
- Rio Elementary'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 Rio Del Mar
How many students attend Rio Del Mar?
Rio Del Mar has 499 students enrolled. It is an elementary school in Oxnard, CA.
What is the student-teacher ratio at Rio Del Mar?
The student-teacher ratio at Rio Del Mar is 31.2:1, which is 45% higher than the California average of 21.5:1 and 99% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Rio Del Mar?
45.2% of students at Rio Del Mar are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Rio Del Mar?
The largest demographic group at Rio Del Mar is Hispanic or Latino at 83.8% of enrollment, in Oxnard, CA.
What is the Resource Investment Index for Rio Del Mar?
Rio Del Mar has a Resource Investment Index of 30/100 (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 Rio Del Mar rank among elementary schools in Oxnard?
By Resource Investment Index, Rio Del Mar ranks #7 of 32 elementary schools in Oxnard, 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 Oxnard on the city page.
Is Rio Del Mar a good school?
Rio Del Mar earns 30/100 on the Resource Investment Index, with class sizes larger than 97% 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 Rio Elementary?
Besides Rio Del Mar, Rio Elementary also operates Rio Del Sol (839 students), Rio Real Elementary (794 students), and Rio Vista Middle (637 students). See the Rio Elementary 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.