Mt. Diablo Elementary

Mt. Diablo Elementary is a K-5 school of sizable scale in Clayton, California, one of the schools within Mt. Diablo Unified, teacheing 739 students in grades K through 5. That puts it 59% larger than the typical public school in California, which averages around 465 students.

Mt. Diablo Elementary is one of 50 schools operated by Mt. Diablo Unified, a district that educates 29,210 students overall.

In terms of who attends, Mt. Diablo Elementary records that the largest single group is White at 52%, but no single group is in the majority. Other groups include 18% multiracial, 17% Hispanic, 12% Asian. That is meaningfully more White than the county at large, where the share is closer to 41%.

On the income-and-resources front, Mt. Diablo Elementary lists 25 full-time-equivalent teachers, putting the student-to-teacher ratio at about 30.0:1. Statewide, the average ratio sits near 22.3:1, putting Mt. Diablo Elementary higher than the state norm the norm. About 21% of enrolled students meet the income threshold for free or reduced-price lunch, which schools and policymakers use as a rough income-mix signal. By comparison, Contra Costa County runs at roughly 45%, so the school's eligibility rate is meaningfully below the surrounding baseline.

On a residual basis (actual vs predicted given the student mix), Mt. Diablo Elementary sits in the middle band of the BeatsExpectations distribution. Schools with this campus's student mix typically land near 67.0%; this one delivers 69.2%.

In the surrounding community, census data for Contra Costa County shows median household income runs about $127,229, 45% of adults hold a bachelor's degree or higher, and roughly 6% of residents live below the federal poverty line. Mt. Diablo Elementary is one of 280 public schools in Contra Costa County (combined enrollment of about 167,423 students).

The closest other public school is Pine Hollow Middle, roughly 0.8 miles away. Counting just inside five miles, 8 other public schools cluster around Mt. Diablo Elementary. Among the 8 schools in that immediate cluster with test data (this one included), Mt. Diablo Elementary ranks 1st on composite proficiency, ahead of the local average of 43.4%.

The campus sits in an outer-ring setting.

Five-year trend. Looking back 7 years, enrollment at Mt. Diablo Elementary has contracted 9%, going from 808 students in 2018 to 739 in 2025. White enrollment moved from 45% to 52% across the same window. Class-load math has rose: from 24.7:1 in 2018 to 30.0:1 in 2025.

On the community side, members of the Mt. Diablo Elementary community share and discuss pickup logistics, teacher feedback, and after-school programs. Parents, students, alumni, and staff are welcome to weigh in.