1
Enrollment
739
Elementary
DISTRICT 480 · STATE 465
SCHOOL COMMUNITY·MT. DIABLO UNIFIED·NCES 062637003959
Mt. Diablo Elementary
5880 Mt. Zion Dr., Clayton, CA 94517 · (925) 672-4840 · Contra Costa County
GRADES KG–05ELEMENTARY21-SUBURBREGULAR SCHOOL739 STUDENTS
A-
allk12 Grade
Scored higher than 79% of California public elementary schools
- ATest scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
- BBeats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
- B+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 elementary schools
Student : Teacher
30.0:1
25 FTE teachers
DISTRICT 25.3:1 · STATE 22.3:1
Free / Reduced Lunch
21%
155 students
DISTRICT 56% · STATE 65%
Community
6
0 members
Enrollment and student:teacher ratio compared against other elementary schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Kindergarten | 150 | 20% |
| Grade 1 | 126 | 17% |
| Grade 2 | 119 | 16% |
| Grade 3 | 116 | 16% |
| Grade 4 | 114 | 15% |
| Grade 5 | 114 | 15% |
This year's kindergarten class (150) is 32% larger than its 5th grade class (114).
Student demographics
65%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 71% · 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
Test scores
CAASPP 2024-25 . % met or exceeded standardEnglish Language Arts
71.3%
CA avg 49.1% . +2.3pp since 2014
Math
68.1%
CA avg 37.7% . +5.1pp since 2014
What this means: On the CAASPP, California's statewide test, about 71 of every 100 students at this school read and write at grade level and about 68 of 100 do math at grade level. Across all California schools, those numbers are about 49 and 38. Reading and writing scores are up about 2 points since 2014, while math scores are up about 5 points.
Performance levels, 2024-25
| Subject | Standard Exceeded | Standard Met | Standard Nearly Met | Standard Not Met |
|---|---|---|---|---|
| English Language Arts | 39.0% | 32.3% | 17.8% | 10.9% |
| Math | 36.6% | 31.6% | 20.9% | 10.9% |
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 | 71.3% | 68.1% |
| 2023-24 | 69.0% | 69.0% |
| 2022-23 | 67.2% | 65.8% |
| 2021-22 | 67.5% | 63.1% |
| 2020-21 | 67.0% | 58.3% |
| 2018-19 | 71.8% | 62.9% |
| 2017-18 | 75.9% | 62.5% |
| 2016-17 | 73.3% | 62.4% |
| 2015-16 | 74.0% | 64.0% |
| 2014-15 | 69.0% | 63.0% |
% 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
69.5%
composite math + reading, all grades
Predicted
67.3%
based on CA schools with similar FRL share
Beats by
+2.2pp
above demographic expectation
What this means: About 69% of students here test proficient in math and reading, compared with the roughly 67% 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 Mt. Diablo Elementary
Mt. Diablo Elementary's state test result (69.5% proficient) is higher than 2 of the 4 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Mt. Diablo Elementary this school | 739 | 21.0% | 69.5% |
| Carrillo Elementary Carlsbad | 725 | 22.6% | 67.9% |
| Thomas Jefferson Elementary Burbank | 758 | 22.7% | 59.9% |
| Community Montessori Escondido | 795 | 17.6% | N/A |
| Aviara Oaks Elementary Carlsbad | 612 | 22.1% | 81.5% |
| Lang Ranch Thousand Oaks | 723 | 18.7% | 80.1% |
Matched among California elementary 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 Mt. Diablo Elementary ranks
Among elementary schools| Measure | This school | In California | In Contra Costa County |
|---|---|---|---|
| State test proficiency ranked highest first | 69.5% | #678 of 5,151 | #39 of 149 |
| Math proficiency ranked highest first | 68.1% | #682 of 5,172 ▼ 25 | #41 of 153 ▼ 4 |
| Reading proficiency ranked highest first | 71.3% | #688 of 5,172 ▲ 90 | #39 of 153 ▼ 3 |
| 3-year test score change ranked biggest gain first | +4.4pp | #1,846 of 5,116 | #36 of 150 |
| Enrollment ranked largest first | 739 | #583 of 5,915 | #10 of 164 |
| Students per teacher ranked fewest first | 30.0:1 | #5,315 of 5,352 | #155 of 162 |
| Diversity index ranked most diverse first | 65.4% | #1,199 of 5,354 | #84 of 162 |
| Free and reduced lunch ranked highest share first | 21.0% | #5,115 of 5,625 | #112 of 158 |
| Enrollment change since 2017-18 ranked steepest decline first | -8.5% | #2,878 of 3,837 | #74 of 107 |
Ranked against other public elementary 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
739
-4 (-1%) vs 2020
-16% since 1990-91, when it was 884
Student : Teacher
30.0:1
was 28.6:1
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 | 739 | 24.6 | 30.0:1 | 21% (155) |
| 2023-24 | 738 | 25.6 | 28.8:1 | 8% (62) |
| 2022-23 | 693 | 21.6 | 32.1:1 | 5% (36) |
| 2020-21 | 743 | 26 | 28.6:1 | 7% (49) |
| 2017-18 | 808 | 32.7 | 24.7:1 | 8% (64) |
| 2015-16 | 816 | 30 | 27.2:1 | 8% (67) |
| 2010-11 | 811 | N/A | N/A | 4% (35) |
| 2000-01 | 849 | 37 | 22.9:1 | 2% (14) |
| 1990-91 | 884 | 31 | 28.5:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for Mt. Diablo Elementary.
Since 2017-18: students down 9% (808 to 739); teachers down 25% (32.7 to 24.6).
About Mt. Diablo Elementary
Mt. Diablo Elementary is an elementary school in Clayton, California, reachable at (925) 672-4840. It serves 739 students in kindergarten through 5. The average among elementary schools in California is roughly 465 students; this school is 59% larger than that.
In Mt. Diablo Unified, 50 schools enroll a combined 29,210 students.
Mt. Diablo Elementary's enrollment is 52% White. The next largest groups are 18% multiracial, 17% Hispanic, and 12% Asian. In Contra Costa County overall, about 41% of residents are White. Mt. Diablo Elementary has a diversity index of 65%, compared with 70% for all US public school students.
A ratio of 30.0:1 comes from the school's 24.6 full-time-equivalent teachers. The 22.3:1 average for elementary schools in California is lower than this school's figure. The school's lunch program data list 21% of students as eligible for free or reduced-price meals. That is 24 points below the 45% average for public schools in Contra Costa County.
Mt. Diablo Elementary is graded A- by allk12, scoring above 79% of California public elementary schools once test results, poverty-adjusted performance, and the recent trend are combined.
When test results are adjusted for free or reduced-price lunch eligibility, Mt. Diablo Elementary is 2.2 points above its prediction. Actual: 69.5%. Predicted: 67.3%.
Recent Census Bureau figures for Contra Costa County show that median household income is about $127,229, a bachelor's degree or higher is held by about 45% of adults, and the share of residents below the poverty line is 6%. Mt. Diablo Elementary is one of 280 public schools in Contra Costa County, which together enroll about 167,423 students.
Pine Hollow Middle is the closest public school, about 0.8 miles away in a straight line. There are at least 8 more public schools inside five miles. Among the 8 closest schools with test data, this one included, Mt. Diablo Elementary ranks 1st on average proficiency.
Mt. Diablo Elementary is coded as Suburb: Large in federal locale data.
Mt. Diablo Elementary had 743 students in 2020-21 and 739 in 2024-25, nearly the same. The student-to-teacher ratio rose from 28.6:1 in 2020-21 to 30.0:1 in 2024-25.
Discussions about Mt. Diablo Elementary may include sports tryouts, band and choir, and theater. Questions from prospective families are welcome too.
Contra Costa County at a glance
View full county profilePopulation
1,165,012
Census ACS
Median income
$127,229
Household, ACS
Bachelor's+
45%
Adults 25+
Poverty rate
6%
Below federal line
Schools in county
280
167,423 students
Quick facts
Related schools
Other schools in Mt. Diablo Unified
- College Park HighHigh · 1,948 students
- Northgate HighHigh · 1,546 students
- Mt. Diablo HighHigh · 1,397 students
- Concord HighHigh · 1,137 students
- Ygnacio Valley HighHigh · 1,059 students
- Foothill MiddleMiddle · 1,005 students
Nearby schools
- Pine Hollow Middle0.8 mi · 538
- Highlands Elementary1.0 mi · 512
- Diablo View Middle1.2 mi · 514
- Clayton Valley Charter High1.7 mi · 2,373
- Ayers Elementary2.0 mi · 394
- Silverwood Elementary2.3 mi · 530
Frequently asked questions
About Mt. Diablo ElementaryHow large is Mt. Diablo Elementary?
Mt. Diablo Elementary enrolls approximately 739 students in grades KG-05.
What grades does Mt. Diablo Elementary serve?
Mt. Diablo Elementary serves grades KG-05.
What is the student-teacher ratio at Mt. Diablo Elementary?
The student-to-teacher ratio at Mt. Diablo Elementary is approximately 30.0:1 (25 FTE teachers).
What is the racial breakdown of students at Mt. Diablo Elementary?
At Mt. Diablo Elementary, the student body is approximately 52% White, 17% Hispanic, 1% Black, 12% Asian, 18% Two or more.
Who oversees Mt. Diablo Elementary?
Mt. Diablo Elementary is overseen by Mt. Diablo Unified in Contra Costa County.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.