King Open

King Open operates as a reasonably sized elementary-level community in Cambridge, Massachusetts, run under Cambridge. Current enrollment sits at 391 students spanning grades pre-K through 5.

Within Cambridge, which oversees 17 schools and 7,027 students, King Open is one campus in the system.

Demographically, King Open shows that 33% of students identify as White, with the remaining enrollment distributed across several groups. Other groups include 24% Black, 17% Hispanic, 15% multiracial, 11% Asian. By comparison, Middlesex County as a whole is about 67% White, so the school skews visibly less White than its surroundings.

Looking at the economic backdrop, On paper, King Open has 37 full-time-equivalent teachers, translating to a class-load average of around 10.4:1. Statewide, the average ratio sits near 12.2:1, putting King Open tighter than the state norm the norm.

Across the wider county, ACS estimates for Middlesex County put median household earnings sit near $130,847, roughly 60% of adults have completed at least a four-year degree, and census figures put the poverty rate at about 5%. In all, Middlesex County runs 386 public schools (combined enrollment of about 215,896 students), of which King Open is one.

Nearest neighbor: Cambridge Street Upper School, around 0.0 miles off. Counting just inside five miles, 8 other public schools cluster around King Open.

Geographically, the school is in a high-density area.

Trend over the last 7 years. Over the past 7-year window, the student count grew 19%: 329 students in 2018 compared to 391 in 2025. The White share of enrollment ticked down from 44% to 33% over that span. Class-load math has rose: from 9.4:1 in 2018 to 10.4:1 in 2025.

In the discussion threads here, the page collects discussion, questions, and updates around science fair prep, picture-day reminders, and bus-route questions. Anyone with firsthand experience at this school can post or comment.