Summary:
Millburn’s five listed schools span prekindergarten through grade 12, serving 3,473 students from South Mountain School (278 students) to Millburn High School (1,380). Results are strong across the area: in 2025–26, every reported school-grade test result was above its corresponding New Jersey state result. The average school advantage was 38 percentage points in ELA, 35 in grades 3–8 math, and 44 in science—the clearest overall finding for families.
No one school leads in every subject or grade. Among the elementary schools, Wyoming School was ahead of South Mountain School by 9 points in grade 3 ELA and 6 points in grade 4 math; they tied at 80% in grade 3 math, and grade 4 ELA was nearly even at 91.9% and 91.3%. The sharpest contrast is Algebra I end-of-course: Millburn Middle School scored 97%, versus 43% at Millburn High School, a 54-point gap. The high school result was only 3 points above the state result. Within the middle school, regular grade 8 math was a relative low point at 26%, just 3 points above the state, despite its very high Algebra I results. Science results at the middle school, Washington School, and the high school each exceeded their grade’s state result by 41–48 points.
Year-to-year changes vary by subject and grade. The average ELA advantage over the state grew from 32 to 38 points, while the math advantage narrowed from 39 to 35 and science from 46 to 44. At the high school, grade 9 ELA rose from 83% to 90%, but grade 11 science fell from 80% to 69%; grade 10 Geometry fell from 36% to 24%. SchoolDigger rankings remain five stars for all reported schools: Wyoming’s percentile rose from 96 to 98, while the high school’s fell from 93 to 91. As context, all five schools reported free/reduced lunch eligible for 2024–25, with shares from about 2% to 3%; student-teacher ratios ranged from 9.6 at South Mountain to 12.8 at Wyoming.
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