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For the 2026 school year, there is 1 public middle school serving 488 students in Mountainside, NJ.

The top-ranked public middle school in Mountainside, NJ is Deerfield Elementary School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Mountainside, NJ public middle school have an average math proficiency score of 76% (versus the New Jersey public middle school average of 34%), and reading proficiency score of 81% (versus the 48% statewide average). Middle schools in Mountainside have an average ranking of 10/10, which is in the top 5% of New Jersey public middle schools.

Minority enrollment is 32% of the student body (majority Hispanic), which is less than the New Jersey public middle school average of 68% (majority Hispanic).