Summary
Joseph Demello is a K–5 elementary school in South Dartmouth, MA, part of the Dartmouth Public Schools district, serving 392 students in a coastal area near New Bedford. In 2025–2026, it ranked 252 of 899 Massachusetts elementary schools, placing it in the 72nd percentile with 4 stars; the Dartmouth district overall ranked 153 of 351 districts (56th percentile, 3 stars). That means Joseph Demello is performing above its district’s average statewide standing. The school has been a 4-star school for four consecutive reported years, from 2022–2023 through 2025–2026, after reaching only the 51st percentile in 2017–2018.
In 2025–2026, Joseph Demello’s proficiency rates were above both the district and state averages in all three tested subjects: English language arts 50.53%, mathematics 57.89%, and science 47.54%. Mathematics is the clearest strength: 3rd grade math was 63.79% and 4th grade math was 67.14%, while 5th grade math was 41.94%, much closer to the state average. Compared with the nearest same-district school, James M. Quinn School, Demello outperformed in every 2025–2026 grade/subject comparison, including an all-grade math gap of +20.90 points and a 3rd grade math gap of nearly 43 points (63.79% vs. 20.80%). Among nearby New Bedford schools, most are much lower-performing, though William H Taylor is a close peer in all-grade ELA and math, and James B Congdon is stronger in science and 5th grade. Demello remains the highest-ranked nearby school by percentile.
Subgroup results show notable effectiveness: low socio-economic status students ranked 9 of 742, in the 99th percentile with 5 stars in 2025–2026, up from the 85th percentile in 2024–2025. Special education students ranked in the 86th percentile. Parents should note a few relative watch points: 5th grade math is closer to the state average, and science fell from 64.29% in 2024–2025 to 47.54% in 2025–2026, though it remains above district and state averages. The school also had the highest student–teacher ratio (14.7) among the nearby schools and comparatively low per-student spending ($14,984 in 2020–2021), yet posted strong outcomes; the data do not establish causation, and economic composition could not be fully analyzed from the available free/reduced-lunch field.
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