Enrollment
359
California · 2024-25 NCES data
Middle school (grades 6-8) · Tiburon, CA
Del Mar Middle
Federal NCES profile for Del Mar Middle, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 46/100.
2024-25 NCES dataMiddle school (grades 6-8)NCES 063216004977
👥 S:T ratio 54
🌟 Gifted program 30
📋 Attendance 54
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Del Mar Middle earns 46/100 on the Resource Investment Index, with class sizes smaller than 94% of California schools.
- #1 of 3
- public schools in Tiburon · Resource Index
- 46
- Resource Index · Typical
- 11.6:1
- small classes for California
- 5.5%
- free-lunch eligible
Del Mar Middle has class sizes smaller than 94% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Del Mar Middle ranks #1 of 3 public schools in Tiburon, CA.
School address
District: Reed Union Elementary · California
NCES ID 063216004977 Verify on NCES CCD record →
Teachers (FTE)
31.0
Federal CCD staff survey
Students per teacher
11.6:1
vs 21.5:1 California avg
-46% vs state
Free-lunch eligible
5.5%
vs 55.5% California avg
-90% vs state
Student-teacher ratio in context
How Del Mar Middle compares with California and U.S. medians
What stands out at Del Mar Middle
Del Mar Middle is a lower-poverty, mid-sized middle school in Tiburon, California, enrolling 359 students.
Classes run notably small here: at 11.6:1, Del Mar Middle is leaner than roughly 94% of California schools and 46% under the state's 21.5:1 norm, more adult attention per pupil than most peers.
Comparatively few students face economic hardship here, 5.5% free-meal eligibility runs 90% below the California average.
Enrollment of 359 puts it in the smaller third of California schools by headcount.
Its Resource Investment Index lands in the upper third of 9,998 scored California schools.
Against 425 statewide peers matched on enrollment and economic need, it ranks in the upper tier at #71.
Its student body is led by White (71%) and Two or More (12%) (diversity index 47/100).
Attendance runs somewhat below the norm, with 18.4% of students chronically absent per the 2021-22 civil-rights collection.
The surrounding Reed Union Elementary spends $23,744 per pupil, 44% above the California average, a better-resourced district than most.
Reed Union Elementary also operates Reed Elementary (362 students) and Bel Aire Elementary (322 students) alongside Del Mar Middle.
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 Del Mar Middle compares
Del Mar Middle on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 11.6:1 | ▼ 46% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 5.5% | ▼ 90% | 55.5% | 51.7% |
| Enrollment | 359 | top 67% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
11.6:1
Leaner classes than 79% of US schools, among the more generously staffed nationally.
359
Bigger than 41% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
5.5%
free-lunch eligible
- 90% 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
11.6:1
students per teacher
- 46% below state mean
Top 6% in California - lower ratio than 94% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
18.4%
chronically absent (missed 10%+ of school days)
In the 15-20% range, nearing the "high" absenteeism threshold.
Funding equity
$23,744
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
Counselors0.0 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
8
in-school suspensions + 8 out-of-school
Suspension rate: 2.2 per 100 students. Combined in-school and out-of-school rate: 4.5 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
White 70.6%
Two or More 12.3%
Hispanic or Latino 9.0%
Asian 7.0%
African American 0.8%
American Indian / Alaska Native 0.3%
Largest group: White at 70.6% of enrollment.
Student-body diversity index 47.3/100
Simpson diversity index - at 47.3, Del Mar Middle is about as mixed as the California school average of 46.0.
Programs
Funding & spending
District-wide per-pupil expenditure for Reed Union Elementary, which includes Del Mar Middle.
$23,744
Per student
+44%
vs California
Avg $16,509
+43%
vs U.S.
Avg $16,593
Revenue mix
Local 89.8%
State 8.4%
Federal 1.8%
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 Del Mar Middle Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Reed Elementary | Similar size | Similar economic need | Higher S:T ratio |
| Bel Aire Elementary | Similar size | Similar economic need | Higher S:T ratio |
Comparisons are relative to Del Mar Middle's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 362
- Students per teacher
- 19.1:1
- Resource Index
- 44/100
- Enrollment
- 322
- Students per teacher
- 17.9:1
- Resource Index
- 45/100
Similar middle 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 (~359 students)
Similar student-teacher ratio (~11.6:1)
Next steps
Verify locally before acting on Del Mar Middle's federal record.
- Compare Del Mar Middle against another school. Compare schools
- Reed Union 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 Del Mar Middle
How many students attend Del Mar Middle?
Del Mar Middle has 359 students enrolled. It is a middle school in Tiburon, CA.
What is the student-teacher ratio at Del Mar Middle?
The student-teacher ratio at Del Mar Middle is 11.6:1, which is 46% lower than the California average of 21.5:1 and 26% lower 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 Del Mar Middle?
5.5% of students at Del Mar Middle are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Del Mar Middle?
The largest demographic group at Del Mar Middle is White at 70.6% of enrollment, in Tiburon, CA.
What is the Resource Investment Index for Del Mar Middle?
Del Mar Middle has a Resource Investment Index of 46/100 (typical reported resources relative to schools nationally) based on 3 factors: student-teacher ratio, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Del Mar Middle rank among public schools in Tiburon?
By Resource Investment Index, Del Mar Middle ranks #1 of 3 public schools in Tiburon, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Tiburon on the city page.
Is Del Mar Middle a good school?
Del Mar Middle earns 46/100 on the Resource Investment Index, with class sizes smaller than 94% 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 Reed Union Elementary?
Besides Del Mar Middle, Reed Union Elementary also operates Reed Elementary (362 students) and Bel Aire Elementary (322 students). See the Reed Union 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.