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For the 2025-26 school year, there are 2 public schools serving 748 students in Mountainside, NJ (there are , serving 238 private students). 76% of all K-12 students in Mountainside, NJ are educated in public schools (compared to the NJ state average of 86%).

The top ranked public 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 schools have an average math proficiency score of 76% (versus the New Jersey public school average of 38%), and reading proficiency score of 81% (versus the 49% statewide average). Schools in Mountainside have an average ranking of 10/10, which is in the top 5% of New Jersey public schools.

Minority enrollment is 31% of the student body (majority Hispanic), which is less than the New Jersey public school average of 62% (majority Hispanic).