The headline
The largest US public elementary schools enroll 2,000 to 4,000+ students, far larger than the typical elementary school of 400-600 students.
The biggest in our 2024-25 NCES data include Chester Community Charter School in Chester PA (3,782 students), Mason Intermediate Elementary in Mason OH (3,086), American Academy in Castle Pines CO (2,803), Aventura Waterways K-8 Center in Miami FL (2,063), and Pembroke Pines Charter Elementary in Pembroke Pines FL (2,046).
How a 2,000-student elementary works
At 2,000+ students, elementary schools typically operate as multi-track facilities with two or three full grade-level teams per grade, dedicated specialists for each subject, and complex bus and lunch scheduling. Most are housed in purpose-built campuses with multiple buildings rather than a single elementary building.
Many of the largest elementaries are technically "K-8 centers" or "intermediate elementaries" (covering grades 4-6 only, with K-3 in feeder schools), which inflates their headcount relative to a traditional K-5 elementary.
Why elementary scale matters more than high school scale
The research on school size effects on outcomes is more conclusive for elementary than for high school. Very large elementaries, particularly those serving large shares of low-income students, tend to produce weaker reading and math outcomes than smaller elementaries serving comparable populations. The mechanism is straightforward: at 2,000+ students with 100+ teachers, the principal cannot maintain instructional oversight of each classroom, and consistent curriculum implementation becomes structurally hard.
This does not mean every large elementary underperforms. Some on the list, particularly the wealthy suburban examples, post strong outcomes. But the size itself is a real operational challenge.
Methodology
Source: NCES Common Core of Data 2024-25. Filter limited to schools classified Elementary (PK-5, K-5, K-6, or PK-6) and brick-and-mortar (in-person rather than virtual). Several entries on the list are technically K-8 centers or charter networks operating under a single NCES ID; these are flagged.