Summary:
ZIP code 01450, which covers Groton, Massachusetts, contains just one high school: Groton Dunstable Regional, a grades 9–12 campus of about 659 students (roughly 165 per grade) that is part of the Groton-Dunstable district.
On state benchmarks, this school stands out clearly. The Groton-Dunstable district ranks 34th of 351 Massachusetts districts (90th percentile, 5 stars), and the high school itself ranked 45th of 353 state high schools in 2025-2026 — the 87th percentile, or top 13%. Its MCAS proficiency rates run roughly 1.5× to 1.7× the state average: math 75.00% versus 43.73% statewide, English language arts 69.40% versus 45.48%, science 65.63% versus 40.50%, and biology 58.82% versus 37.68%. Mathematics is the strongest subject and the only one that held steady while the state declined; science saw its lead widen the most, gaining 1.1 points while the state fell 5.4. English language arts is the soft spot, dropping 6.3 points year over year — the state also fell, but slightly less. Note that the biology results across the two years cover different student groups, so they are not a fair year-over-year comparison.
Completion outcomes are near the ceiling: a 97.5% graduation rate and a 0.0% dropout rate, with the graduation rate above the district's own 95.3%. Staffing is 13.7 students per teacher, and per-pupil spending was $17,906 in 2020-2021 — useful context, but five years older than the test data. A few caveats for parents: the free/reduced-lunch figure is not reported, only one year of graduation data exists, and the school's rank has moved 38 → 50 → 45 over three years while staying in the top 15% of the state each time.
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