Summary:
The Millburn Township School District includes eight schools serving grades PK–12: five elementary schools, two schools labeled middle, and one high school. SchoolDigger ranks the district 14th of 607 in New Jersey, in the 98th percentile, with five stars. The clearest overall finding is that all five elementary schools scored above state proficiency rates in grade 3 and grade 4 ELA and math in 2025–2026; across those 20 results, schools averaged 86% proficient, compared with 48% statewide.
Glenwood School stands out at the top of the matched elementary results: its average across the four grade-subject results was 92%, compared with 85% at the other four elementary schools, an 8-point difference. South Mountain School was at the lower end, averaging 82%, 5 points below the other four schools’ 87% average, though still above the state in each result. At Millburn Middle School, grade 8 math is a notable exception to otherwise strong results: 26% were proficient, just 3 points above the state’s 23%, while the school’s grade 6 and 7 rates were 90% and 80%. Millburn High School pairs strong grade 9 ELA (90% versus 51% statewide) and grade 11 science (69% versus 29%) with a 98% graduation rate, 9 points above the state.
Recent trends are mixed rather than uniformly upward. The elementary average edged from 86% in 2024–2025 to 86% in 2025–2026, while the average school–state gap widened from 38 to 39 points; at Millburn High, comparable test-result margins narrowed by about 6 points on average, although grade 9 ELA improved. SchoolDigger’s rankings also differ: Glenwood ranked 5th in both 2024–2025 and 2025–2026, while South Mountain moved from 19th to 60th and Millburn High from 10th to 40th. School characteristics offer context, not explanations: reported student-teacher ratios were 12.7 at Glenwood and 9.6 at South Mountain, and the reported free/reduced lunch eligible measure for 2024–2025 ranged from 1% at Hartshorn School to 3% at South Mountain.
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