Summary:
ZIP code 02420 has exactly one middle school, Wm Diamond Middle, serving grades 6–8 in Lexington, Massachusetts, with 936 students as part of the Lexington district, which is ranked 6th of 351 Massachusetts districts at the 98th percentile with 5 stars. Because there is only one middle school here, its results are best compared with the district and state averages rather than with other local middle schools.
Wm Diamond Middle is a top-tier Massachusetts middle school: it ranked 10th of 478 schools in 2025–2026, 11th of 484 in 2024–2025, and 7th of 493 in 2023–2024, staying in the top 2% each year with 5 stars. In 2025–2026, all-grade proficiency was 73.74% in ELA versus 40.03% statewide, 82.72% in Mathematics versus 41.11% statewide, and 75.00% in Science versus 40.98% statewide. Mathematics is especially strong, with 8th-grade math at 85.12% and 6th-grade math at 84.88%; all-grade math rose from 78.91% to 82.72%, while ELA dipped from 75.11% to 73.74% and Science slipped from 75.58% to 75.00%. The school reports a 9.4:1 student-teacher ratio and $19,867 per-student spending in 2020–2021.
Relative soft spots exist only against an extremely high-performing district: grade 7 ELA was 66.77%, 5.02 points below the Lexington district but 26.86 points above the state; grade 7 math was 2.63 points below district but 40.98 points above state; and grade 8 civics was 74.31%, 2.10 points below district but 34.54 points above state. Grade 8 is particularly strong in ELA and math. The free/reduced lunch percentage for 2024–2025 is not available, so it should not be treated as zero. Overall, this is an exceptionally high-performing school with elite math results and only minor relative dips against district averages.
Thank you for your feedback!