Enrollment
359
Middle
DISTRICT 348 · STATE 659
SCHOOL COMMUNITY·REED UNION ELEMENTARY·NCES 063216004977
Del Mar Middle
105 Avenida Miraflores, Tiburon, CA 94920 · (415) 435-1468 · Marin County
GRADES 06–08MIDDLE21-SUBURBREGULAR SCHOOL359 STUDENTS
A
allk12 Grade
Scored higher than 92% of California public middle schools
- A+Test scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
- B+Beats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
- A-Three-year trend Change in reading and math proficiency over the last three test years.
Grades compare a school only with schools in the same state, because every state gives its own test. How grades work · Top-graded California public middle schools
Student : Teacher
11.7:1
31 FTE teachers
DISTRICT 15.4:1 · STATE 20.7:1
Free / Reduced Lunch
5%
17 students
DISTRICT 5% · STATE 65%
Community
0
0 members
Enrollment and student:teacher ratio compared against other middle schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Grade 6 | 118 | 33% |
| Grade 7 | 112 | 31% |
| Grade 8 | 129 | 36% |
Student demographics
47%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 49% · STATE 62% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
School pathway
Feeds from
Based on grade levels within Reed Union Elementary. Attendance zones can vary; confirm enrollment with the district.
Test scores
CAASPP 2024-25 . % met or exceeded standardEnglish Language Arts
83.8%
CA avg 49.1% . -4.2pp since 2014
Math
81.3%
CA avg 37.7% . +0.3pp since 2014
What this means: On the CAASPP, California's statewide test, about 84 of every 100 students at this school read and write at grade level and about 81 of 100 do math at grade level. Across all California schools, those numbers are about 49 and 38. Reading and writing scores are down about 4 points since 2014, while math scores have held steady.
Performance levels, 2024-25
| Subject | Standard Exceeded | Standard Met | Standard Nearly Met | Standard Not Met |
|---|---|---|---|---|
| English Language Arts | 46.6% | 37.2% | 11.4% | 4.8% |
| Math | 57.7% | 23.6% | 12.2% | 6.5% |
Share of tested students at each CAASPP level. Each student counts in one level, so a row adds to about 100%.
CAASPP results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 83.8% | 81.3% |
| 2023-24 | 78.6% | 74.9% |
| 2022-23 | 82.1% | 79.7% |
| 2021-22 | 81.0% | 72.3% |
| 2020-21 | 82.5% | 76.5% |
| 2018-19 | 86.5% | 81.1% |
| 2017-18 | 81.9% | 78.4% |
| 2016-17 | 87.8% | 80.0% |
| 2015-16 | 86.0% | 81.0% |
| 2014-15 | 88.0% | 81.0% |
% met or exceeded standard, all students and all tested grades.
Source: CAASPP. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
79.6%
composite math + reading, all grades
Predicted
76.8%
based on CA schools with similar FRL share
Beats by
+2.9pp
above demographic expectation
What this means: About 80% of students here test proficient in math and reading, compared with the roughly 77% typical for California schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among California's top nor bottom 10%.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
Schools most like Del Mar Middle
Del Mar Middle's state test result (79.6% proficient) is higher than 4 of the 5 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Del Mar Middle this school | 359 | 4.7% | 79.6% |
| Hall Middle Larkspur | 440 | 10.7% | 75.0% |
| Scotts Valley Middle Scotts Valley | 463 | 11.2% | 60.6% |
| Corte Madera Portola Valley | 252 | 6.7% | 85.1% |
| Adaline E. Kent Middle Kentfield | 488 | 10.7% | 77.1% |
| Willma Cavitt Junior High Granite Bay | 375 | 8.5% | 77.9% |
Matched among California middle schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.
Where Del Mar Middle ranks
Among middle schools| Measure | This school | In California | In Marin County |
|---|---|---|---|
| State test proficiency ranked highest first | 79.6% | #40 of 1,224 | #1 of 10 |
| Math proficiency ranked highest first | 81.3% | #25 of 1,227 ▲ 29 | #1 of 10 ▲ 1 |
| Reading proficiency ranked highest first | 83.8% | #35 of 1,227 ▲ 46 | #1 of 10 ▲ 2 |
| 3-year test score change ranked biggest gain first | +5.9pp | #252 of 1,214 | #3 of 10 |
| Enrollment ranked largest first | 359 | #1,134 of 1,377 | #9 of 10 |
| Students per teacher ranked fewest first | 11.7:1 | #2 of 1,279 | #1 of 9 |
| Diversity index ranked most diverse first | 47.4% | #714 of 1,278 | #7 of 9 |
| Free and reduced lunch ranked highest share first | 4.7% | #1,325 of 1,329 | #10 of 10 |
| Enrollment change since 2017-18 ranked steepest decline first | -36.8% | #44 of 930 | #1 of 9 |
Ranked against other public middle schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
359
-138 (-28%) vs 2020
+35% since 1990-91, when it was 265
Student : Teacher
11.7:1
was 15.1:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 359 | 30.7 | 11.7:1 | 5% (17) |
| 2023-24 | 361 | 31.2 | 11.6:1 | 6% (20) |
| 2022-23 | 385 | 31.9 | 12.1:1 | 5% (21) |
| 2020-21 | 497 | 33 | 15.1:1 | 5% (27) |
| 2017-18 | 568 | 32.4 | 17.5:1 | 5% (31) |
| 2015-16 | 543 | 30 | 18.1:1 | 4% (22) |
| 2010-11 | 416 | N/A | N/A | 3% (11) |
| 2000-01 | 382 | 26 | 14.7:1 | 1% (3) |
| 1990-91 | 265 | 15 | 17.7:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for Del Mar Middle.
Since 2017-18: students down 37% (568 to 359); teachers down 5% (32.4 to 30.7).
About Del Mar Middle
Among the schools in Tiburon, California, is Del Mar Middle, a small middle school. A federal count lists 359 students at the school, in grades 6 through 8. Average enrollment for middle schools in California is about 659, so this school runs 46% smaller than that.
Reed Union Elementary has 1,043 students in 3 schools, and Del Mar Middle is one of those schools.
White students account for 70% of enrollment at Del Mar Middle. Other students are 12% multiracial, 9% Hispanic, and 7% Asian. For comparison, Marin County is about 68% White. Del Mar Middle has a diversity index of 47%, compared with 70% for all US public school students.
Del Mar Middle's 30.7 full-time-equivalent teachers put its ratio at 11.7:1. For comparison, middle schools in California average 20.7:1. Eligibility for subsidized school meals is 5%. The rate at public schools in Marin County averages 35%, higher than here.
Measured against California public middle schools, Del Mar Middle receives an A. The grade weighs proficiency most heavily, then how results compare with what the school's low-income share predicts, then the three-year change.
The allk12 BeatsExpectations score for Del Mar Middle is +2.9 points: 79.6% actual, 76.8% predicted.
County data help place the school in context: in Marin County, median household income is about $149,091, roughly 61% of adults have a four-year degree or more, and the share of residents below the poverty line is 4%. The public schools of Marin County number 75 and enroll about 29,867.
Bel Aire Elementary is located about 1.0 miles from Del Mar Middle. Within five miles are at least 8 other public schools. Its average proficiency rate of 79.6% is above the 70.8% average for nearby schools.
Del Mar Middle is coded as Suburb: Large in federal locale data.
Del Mar Middle saw enrollment fall 28% between 2020-21 and 2024-25. By 2024-25, the school had 11.7 students per teacher, compared with 15.1 in 2020-21.
Community posts for Del Mar Middle can cover science fairs, picture day, and bus routes. Questions from prospective families are welcome too.
Marin County at a glance
View full county profilePopulation
257,969
Census ACS
Median income
$149,091
Household, ACS
Bachelor's+
61%
Adults 25+
Poverty rate
4%
Below federal line
Schools in county
75
29,867 students
Quick facts
Related schools
Other schools in Reed Union Elementary
- Reed ElementaryElementary · 362 students
- Bel Aire ElementaryElementary · 322 students
Other schools in Tiburon
- Reed ElementaryElementary · 362 students
- Bel Aire ElementaryElementary · 322 students
Nearby schools
- Bel Aire Elementary1.0 mi · 322
- Reed Elementary1.3 mi · 362
- Strawberry Point Elementary1.3 mi · 259
- Cove2.1 mi · 275
- Dr. Martin Luther King Jr. Academy2.3 mi · 262
- Edna Maguire Elementary2.5 mi · 399
Frequently asked questions
About Del Mar MiddleWhat is the total enrollment at Del Mar Middle?
Del Mar Middle enrolls approximately 359 students in grades 06-08.
What age range does Del Mar Middle serve?
Del Mar Middle serves students from grade 06 through grade 08.
How many teachers does Del Mar Middle have?
Del Mar Middle employs 31 FTE teachers, for a student-to-teacher ratio of 11.7:1.
What is the racial breakdown of students at Del Mar Middle?
At Del Mar Middle, the student body is approximately 70% White, 9% Hispanic, 1% Black, 7% Asian, 12% Two or more.
Is Del Mar Middle public or private?
Del Mar Middle is a public K-12 school, overseen by Reed Union Elementary.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.