Arlington High

As a big 9-12 campus in Arlington, Massachusetts, Arlington High instructs 1,677 students from grades 9 through 12, part of Arlington. That puts it 116% bigger than the typical public school in Massachusetts, which averages around 777 students.

Arlington High is one of 11 schools operated by Arlington, a district that hosts 6,113 students overall.

Looking at the student body, Arlington High records that the largest single group is White, at 69% of enrollment; the rest looks like 10% Asian, 9% Hispanic, 7% multiracial, 3% Black. Compared to Middlesex County overall, the school's racial mix sits in roughly the same range.

Looking at school resources, Arlington High records 123 full-time-equivalent teachers, putting the student-to-teacher ratio at about 13.6:1. That figure is tighter than the state norm's 23.4:1 average.

Around the school, the surrounding county (Middlesex County) records that the typical household earns roughly $130,847 per year, roughly 60% of adults have completed at least a four-year degree, and the poverty rate sits near 5%. Across Middlesex County's 386 public schools (combined enrollment of about 215,896 students), Arlington High is one campus in the mix.

Menotomy Preschool is the nearest neighboring public school, about 0.4 miles from this campus. Within five miles, there are 8 other public schools.

The school occupies a suburban site.

Trend over the last 7 years. Over the past 7-year window, the student count expanded 27%: 1,325 students in 2018 compared to 1,677 in 2025. Over the same period, the White share declined from 74% to 69%.

On allk12, posts here usually surface around enrollment questions, classroom assignments, and PTA news. The community welcomes input from current and former families.