Carlmont High

Carlmont High is a sizable secondary school in Belmont, California, part of Sequoia Union High. The school hosts 2,360 students in grades 9 through 12. Enrollment runs roughly 182% above the state mean of about 838.

Sequoia Union High comprises 6 schools with combined enrollment of 8,419 students; Carlmont High is among them.

In terms of who attends, Carlmont High shows that the largest single group is White at 41%, but no single group is in the majority. The remainder comes out to 33% Asian, 15% Hispanic, 9% multiracial. That composition is broadly in line with San Mateo County as a whole.

Looking at school resources, The school reports having 120 full-time-equivalent teachers, for a student-teacher ratio near 19.7:1. That figure is higher than the state norm's 18.2:1 average. About 9% of enrolled students meet the income threshold for free or reduced-price lunch, a number frequently used as a low-income enrollment indicator. By comparison, San Mateo County runs at roughly 34%, so the school's eligibility rate is meaningfully below the surrounding baseline.

With demographic context factored in, Carlmont High tracks the demographic baseline. The model predicts 74.0% given the school's FRL share; actual proficiency is 80.5%.

In the area at large, ACS estimates for San Mateo County put the typical household earns roughly $158,855 per year, 54% of adults hold a bachelor's degree or higher, and the poverty rate sits near 4%. Carlmont High is one of 176 public schools in San Mateo County (combined enrollment of about 82,403 students).

Mariposa is the nearest neighboring public school, about 0.2 miles from this campus. 8 of the 8 nearest public schools sit inside a five-mile radius. Ranking that nearby cluster on reported proficiency puts Carlmont High at 5th of 8; the average score across the group is 82.2%.

The school occupies a commuter-belt site.

Trend over the last 7 years. Looking back 7 years, enrollment at Carlmont High has increased 8%, going from 2,184 students in 2018 to 2,360 in 2025. The White share of enrollment declined from 52% to 41% over that span. Class-load math has fell: from 22.0:1 in 2018 to 19.7:1 in 2025.

On this page, posts here usually surface around open house dates, ride-share offers, and field-trip permission slips. Contributors range from current parents to recent graduates and teachers.