10 public K-12 schools in Diamond Bar from NCES Common Core of Data: enrollment, grade span, demographics, and Civil Rights Data Collection statistics for every active campus.
10 public schools ranked by quality score. NCES CCD 2024-25 data.
The highest-ranked of Diamond Bar's 10 public schools is Diamond Bar High, scoring 48/100, against a city average of 35.7/100. Computed live across every Diamond Bar campus reporting to NCES.
How the Diamond Bar Public-School Landscape Breaks Down
Diamond Bar, CA enrolls 8,396 students across 10 public schools reporting to the National Center for Education Statistics. The average student-teacher ratio across the city is 25.5:1, and the composite quality score, derived from student-teacher ratio, counselor access, gifted-program availability, and CRDC attendance data, averages 35.7/100. Schools must report at least five campuses in a city to appear in this listing, which is why very small towns may redirect to the broader county or state view.
The most-resourced campus in Diamond Bar on this index is Diamond Bar High, at 48/100 on the Resource Investment Index with 2,563 enrolled students. What the index does and doesn't measure; click any school below for its full component breakdown.
Diamond Bar spans 2 districts, each filing its own NCES F-33 return, per-pupil spending can vary between neighbouring campuses. Sort the table below by enrollment, level, or district; click any school for its full profile.
Diamond Bar High accounts for 30.5% of all Diamond Bar public-school enrollment
That dominant concentration means Diamond Bar-wide averages can mask substantial variation outside the dominant entity. Grade level: High. A dominant campus often anchors a city's program landscape and absorbs a disproportionate share of district capital and staffing decisions. When one entity dominates a region's footprint, its programmatic and budget decisions effectively set policy for a majority of the affected population.
Diamond Bar school enrollment varies 10× across entities
Diamond Bar school enrollment ranges from 251 students (lowest) to 2,563 students (highest), a spread of 2,312 students. That spread reflects typical urban portfolio variation between specialty programs and large neighbourhood schools. Per-school staffing, programme depth, and capital-renovation cycles often diverge inside the same city based on enrollment shape, a 200-student magnet runs a different operational model than a 2,000-student comprehensive high school.
Diamond Bar student-teacher ratio is 25.5:1 — well above typical (typically associated with unusually large scale or acute resource constraints)
student-teacher ratio is the simplest comparative metric but it does not capture the full picture: the ratio counts FTE classroom teachers against total enrollment, push-in specialists, English-language aides, special-education co-teachers, and counselors are not included in most reporting Values this far above typical often signal acute resource constraints or a structurally different scale than most peers — worth reading alongside the underlying counts, not the ratio alone.
Most racially and ethnically mixed schools in Diamond Bar
Ranked by the Simpson student-body diversity index (0-100) from NCES race and ethnicity data, where higher means a more evenly mixed student body. It measures mix, not quality.
The highest-ranked school in Diamond Bar is Diamond Bar High with a quality score of 48/100. There are 10 public schools in Diamond Bar with 8,396 total students.
How many schools are in Diamond Bar, CA? ▼
Diamond Bar has 10 public schools with a total enrollment of 8,396 students. Average student-teacher ratio: 25.5:1.
Data from NCES Common Core of Data (CCD) 2024-25 and Civil Rights Data Collection (CRDC) 2021-22. Quality scores based on student-teacher ratio,
counselor access, gifted programs, and attendance. Schools must have 5+ in the city to be listed.
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the NCES Common Core of Data (CCD). Consult a qualified professional before making decisions based on this data.
Read our methodology, which explains how this data is sourced, computed, and verified.
