Summary:
Zip code 07856 has two schools serving 376 students: Mount Arlington Public School serves grades 3–8, and Edith M. Decker Elementary School serves pre-K–2. The schools enroll 223 and 153 students, respectively. The most important finding is that only Mount Arlington has test scores in the supplied data, so there is no supported academic ranking between the schools; Decker serves different grades.
Mount Arlington stands out for mostly above-state results in its reported 2025–2026 ELA, math, and science comparisons, though its performance varies by grade and subject. Its average was 62% in ELA versus 51% statewide, 52% versus 44% in reported math grades 3–7, and 29% versus 23% in science. Its clearest strengths were grade 7 ELA, 22 points above the state, and grade 3 math, 13 points above. The counterpoints are grade 4 ELA, 8 points below the state, and Algebra I end-of-course proficiency, 14 points below. On available non-test measures, Decker had lower chronic absenteeism—12% versus 16% at Mount Arlington—but a higher student-teacher ratio, 11.4 versus 7.6.
Mount Arlington’s state-relative results moved in different directions over time: from 2024–2025 to 2025–2026, its average advantage narrowed from 17 to 11 points in ELA and from 16 to 6 points in science, while widening from 5 to 8 points in math. Its Algebra I end-of-course result shifted from 12 points above the state to 14 points below. SchoolDigger’s ranking history also shows a rise and then a pullback: Mount Arlington moved from the 67th percentile in 2023–2024 to the 77th in 2024–2025, then to the 70th in 2025–2026. In 2024–2025, free/reduced lunch eligible students made up 26% at Mount Arlington and 25% at Decker; these figures describe school context, not a reason for test results.
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