Arroyo High

Arroyo High is a roomy four-year high school in San Lorenzo, California, part of San Lorenzo Unified. The school serves 1,499 students in grades 9 through 12. By comparison, California's public schools average about 838 students each, so Arroyo High sits 79% above that benchmark.

Arroyo High is one of 16 schools operated by San Lorenzo Unified, a district that teaches 7,936 students overall.

For racial and ethnic makeup, Arroyo High lists that the largest single group is Hispanic at 50%, but no single group is in the majority. Other groups include 31% Asian, 7% White, 6% Black, 4% multiracial. By comparison, Alameda County as a whole is about 23% Hispanic, so the school skews meaningfully more Hispanic than its surroundings.

In terms of school funding signals, Arroyo High lists 61 full-time-equivalent teachers, putting the student-to-teacher ratio at about 24.6:1. That figure is higher than the state norm's 18.2:1 average. An estimated 65% of students are eligible for free or reduced-price lunch, often used as a Title I proxy. That share is north of Alameda County's rate of about 49%.

After controlling for student poverty, Arroyo High sits in the middle band of the BeatsExpectations distribution. Schools with this campus's student mix typically land near 41.0%; this one delivers 41.5%.

Across the wider county, census data for Alameda County shows the typical household earns roughly $129,367 per year, about 52% of the adult population holds a bachelor's degree or above, and the poverty rate sits near 6%. In all, Alameda County runs 394 public schools (combined enrollment of about 210,511 students), of which Arroyo High is one.

The closest other public school is Grant Elementary, roughly 0.2 miles away. Within five miles, there are 8 other public schools. Ranking that nearby cluster on reported proficiency puts Arroyo High at 1st of 7; the average score across the group is 30.3%.

Arroyo High operates from an outer-ring location.

Looking at the recent track record. Over the past 7-year window, the student count ticked down 18%: 1,830 students in 2018 compared to 1,499 in 2025. Over the same period, the Hispanic share climbed from 46% to 50%. Class-load math has rose: from 23.1:1 in 2018 to 24.6:1 in 2025.

Within the allk12 community for this school, members of the Arroyo High community share and discuss science fair prep, picture-day reminders, and bus-route questions. Posting is open to anyone connected to the school.