Diamond Bar High

Located at 21400 Pathfinder Rd., in Diamond Bar, California, Diamond Bar High is a substantial senior high that enrolls 2,563 students (grades 9 through 12), part of Walnut Valley Unified. Enrollment runs roughly 206% bigger than the state mean of about 838.

Walnut Valley Unified runs 15 schools in total, collectively educating 13,992 students. Diamond Bar High is one of those campuses.

On the student-mix side, Diamond Bar High logs that the largest single group is Asian, at 72% of enrollment; the rest reads as 17% Hispanic, 5% White, 4% multiracial. By comparison, Los Angeles County as a whole is about 15% Asian, so the school skews visibly more Asian than its surroundings.

Looking at the economic backdrop, The school currently runs with 99 full-time-equivalent teachers, for a student-teacher ratio near 26.0:1. Statewide, the average ratio sits near 18.2:1, putting Diamond Bar High higher than the state norm the norm. Around 23% of the student body qualifies for free or reduced-price meals, a number frequently used as a low-income enrollment indicator. Set against Los Angeles County (around 70%), the school's rate is somewhat below typical.

On a demographically-adjusted basis, Diamond Bar High sits in the middle band of the BeatsExpectations distribution. Schools with this campus's student mix typically land near 66.0%; this one delivers 72.4%.

In the broader community, the surrounding county (Los Angeles County) reports that median household earnings sit near $90,112, 36% of adults hold a bachelor's degree or higher, and census figures put the poverty rate at about 10%. In all, Los Angeles County runs 2244 public schools (combined enrollment of about 1,265,907 students), of which Diamond Bar High is one.

Nearest neighbor: Evergreen Elementary, around 0.3 miles off. 8 of the 8 nearest public schools sit inside a five-mile radius. Ranking that nearby cluster on reported proficiency puts Diamond Bar High at 7th of 9; the average score across the group is 74.7%.

The school occupies a residential site.

Looking at the recent track record. Looking back 7 years, enrollment at Diamond Bar High has fell 12%, going from 2,918 students in 2018 to 2,563 in 2025. The Asian share of enrollment increased from 67% to 72% over that span.

In the discussion threads here, posts here usually surface around classroom updates, athletics, and weather closures. The community welcomes input from current and former families.