Below Average
#7764 of 9,533 schools in CA
Mt. Diablo High
High School · Mt. Diablo Unified
2450 Grant St., Concord, CA 94520
Enrollment
1,477
Student-Teacher
20:1
Score
4.9
Grades
9th – 12th
Enrollment
1,477
Student-Teacher
20:1
Score
4.9
Grades
9th – 12th
Updated
2022-23
Updated 2022-23
How this school compares
In Concord
#15 of 23
public schools
California high schools
#1,645 of 1,892
In district
#34 of 47
Mt. Diablo Unified
School environment
7.0 / 10
Strong
About Mt. Diablo High
Mt. Diablo High serves 1,477 students in grades 9 through 12 in Concord, California. This regular public high school operates with 74 full-time equivalent teachers, maintaining a student-teacher ratio of 20.0:1.
The school has room for academic growth, with 32% of students achieving proficiency or above in English Language Arts and 10% reaching proficiency in mathematics. Mt. Diablo High ranks in the 21st percentile among California high schools, earning a MySchoolScout rating of 3.5 out of 10.
The school's academic focus appears centered on supporting student development across all achievement levels. Located at 2450 Grant Street, Mt. Diablo High sits within the 94520 ZIP code area, where the median household income is $77,927 and the poverty rate stands at 12.5%.
The surrounding community of nearly 37,000 residents has a median home value of $571,400, with 30% holding bachelor's degrees or higher. The school serves families in this large suburban setting in Contra Costa County, providing comprehensive high school education in an established residential community. Students benefit from the suburban environment while having access to the broader educational and economic opportunities of the East Bay region.
What Parents Should Know
While current test scores at Mt. Diablo High are below average, the school shows strong growth metrics — meaning students are making above-average progress year over year. This upward trajectory can be a positive indicator for families who value a school's ability to help students improve, even if absolute scores haven't caught up yet.
Score Breakdown
Full Profile · 4/4 metricsView breakdown
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Mt. Diablo High — Students at Mt. Diablo High score 21% proficient, which is below what's typical for similar communities (expected: 40%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
61.9%
Students qualifying for federal meal assistance
Test Scores CA CAASPP (2023-24)
Based on 8 test records from CA state assessments. About our data
Proficiency Trend
→ StableAverage proficiency (% at or above grade level) across Math & ELA over time.
* COVID-affected year — test participation was uneven nationwide. This data is weighted at 50% in the Growth score calculation.
Source: EdFacts (NCES) and state assessment data. Growth score: 6.0/10.
How Mt. Diablo High Compares
See how Mt. Diablo High performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Performance Trends
Math proficiency has declined from 15% (2019) to 10.14% (2024). Reading/ELA proficiency has declined from 36% (2019) to 32.18% (2024).
Location
2450 Grant St., Concord, CA 94520
Nearby Alternatives
Families considering Mt. Diablo High may also want to explore other high schools in the area. Floyd I. Marchus (rated 6.9/10, 1.0 miles away), which scores notably higher. Another option is THE CONCORDIA SCHOOL (rated 6.9/10, 1.0 miles away), which scores notably higher. Additionally, Holbrook Language Academy (rated 6.7/10, 0.9 miles away), which scores notably higher. For more schools in Concord, see our Concord schools guide .
Nearby Schools
20 within 1.1 mi| School | Distance | Rating |
|---|---|---|
| QUEEN OF ALL SAINTS SCHOOL Concord | 0.1 mi | 6.3 |
| Queen of All Saints Elementary Concord | 0.1 mi | — |
| BEGINNINGS & BEYOND MONTESSORI Concord | 0.4 mi | — |
| Olympic Continuation High Concord | 0.5 mi | 5.8 |
| Crossroads High Concord | 0.5 mi | — |
| Orion Academy Concord | 0.7 mi | — |
| Building Connections Academy Concord | 0.7 mi | — |
| Rocketship Futuro Academy Redwood City | 0.9 mi | 4.2 |
| Glenbrook Academy Concord | 0.9 mi | — |
| MONTESSORI SCHOOL OF CONCORD Concord | 0.7 mi | — |
| DE LA SALLE ACADEMY Concord | 0.8 mi | 6.6 |
| De La Salle Academy, Inc. Concord | 0.8 mi | — |
| Holbrook Language Academy Concord | 0.9 mi | 6.7 |
| Floyd I. Marchus Concord | 1.0 mi | 6.9 |
| THE CONCORDIA SCHOOL Concord | 1.0 mi | 6.9 |
| Meadow Homes Elementary Concord | 1.2 mi | 2.8 |
| Sun Terrace Elementary Concord | 1.3 mi | 4.8 |
| Anova Center for Education, Contra Costa Concord | 1.1 mi | — |
| ANOVA CENTER FOR EDUCATION Concord | 1.1 mi | 6.5 |
| Wren Avenue Elementary Concord | 1.1 mi | 4.6 |
Neighborhood Census ACS (2019-2023)
Census data for ZIP 94520 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$79,790
Median Home Value
$572,400
Median Rent
$2,118/mo
Population
36,767
College Educated
29.9%
Homeownership
37.4%
Avg Commute
30.2 min
Poverty Rate
12.9%
Median Age
34.6
Community Profile
The community surrounding Mt. Diablo High has a median household income of $79,790. It is an area where 30% of adults hold a bachelor's degree or higher. The median home value in the area is $572,400, with a median rent of $2,118/month. The area has a poverty rate of 12.9%. The average commute for residents is 30 minutes. Source: U.S. Census ACS 2022 5-Year Estimates.
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| Arleta High Arleta, CA | 4.9 |
| CHRISTIAN BROTHERS HIGH SCHOOL Sacramento, CA | 4.9 |
| Cabrillo High Lompoc, CA | 4.9 |
| Center High Antelope, CA | 4.9 |
| Cesar Chavez High Stockton, CA | 4.9 |
| Grace M. Davis High Modesto, CA | 4.9 |
Frequently Asked Questions
Common questions about Mt. Diablo High
What grades does Mt. Diablo High serve?
Mt. Diablo High serves students in grades 9th through 12th.
How many students attend Mt. Diablo High?
Mt. Diablo High has an enrollment of approximately 1,477 students.
What is the student-teacher ratio at Mt. Diablo High?
The student-teacher ratio at Mt. Diablo High is 20:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Mt. Diablo High rank in CA?
Mt. Diablo High is ranked #7764 out of 9,533 schools in CA.
What is Mt. Diablo High's MySchoolScout rating?
Mt. Diablo High has a composite rating of 4.9 out of 10 on MySchoolScout. This score combines academic performance, student growth, and school environment into a single score. Equity data is shown separately for context.
What are the test scores at Mt. Diablo High?
Based on the most recent state assessment data, Mt. Diablo High has 14.3% math proficiency and 36.8% reading/ELA proficiency.
Is Mt. Diablo High a charter school?
No, Mt. Diablo High is not a charter school. It is a traditional public school operated by the local school district.
Is Mt. Diablo High a Title I school?
No, Mt. Diablo High is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Mt. Diablo High?
61.9% of students at Mt. Diablo High qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
Explore More Schools
Neighborhood Context
- Walk Score
- 75 Very Walkable
- Transit Score
- 46 Some Transit
- Bike Score
- 63 Bikeable
- City Safety
- High (3,431/100K)
Powered by 
FBI UCR 2024. City-level (Concord). Data >1 year old.
Quick Facts NCES CCD (SY 2022-23)
- Grades
- 9th – 12th
- Enrollment
- 1,477
- Student-Teacher Ratio
- 20:1
- Teachers (FTE)
- 74
- Free/Reduced Lunch
- 61.9%
- Type
- regular
- Setting
- Large Suburb
- County
- Contra Costa County
- Phone
- (925) 682-4030
- Data Year
- 2023–2024
Resources & Links
District
Mt. Diablo Unified- District Enrollment
- 29,356
- Schools in District
- 52
- Per-Pupil Spending
- $15,421
- District Rank
- #34 of 47
Other Schools in This District
How We Rate Schools
Every school receives a composite score from 1 to 10 based on four pillars: Academic Performance (50%), Student Growth (20%), Equity (15%), and Learning Environment (15%). Scores are built from publicly available data including standardized test results, enrollment figures, and school climate indicators.
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