Mountainside, NJ: Local News, Events & Neighbors

Mountainside is a borough in Union County, in the U.S. state of New Jersey. The borough is located on a ridge in northern-central New Jersey, within the Raritan Valley and Rahway Valley regions in the New York metropolitan area. As of the 2020 United States census, the borough's population was 7,020, an increase of 335 (+5.0%) from the 2010 census count of 6,685, which in turn reflected an increase of 83 (+1.3%) from the 6,602 counted in the 2000 census. Mountainside was incorporated as a borough on September 25, 1895, from portions of Westfield Township, based on the results of a referendum held the previous day. New Jersey Monthly magazine ranked Mountainside as its 16th best place to liv…

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From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)

How Mountainside ranks

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#3Most trails in NJ #10Most conserved land in NJ #29Highest income in NJ All NJ rankings →

Town numbers

ZIP code07092

Area code908

Living in Mountainside

Housing in Mountainside

$1.06M▲ 3.8% in a year Typical home value · Zillow

The typical Mountainside home is worth about $1,065,000, up 3.8% in a year, 83% above the New Jersey typical home.

A strong seller's market

Buyer’sBalancedSeller’s

Days on market13

Sale-to-list107.1%

Sold in May7

Zillow Home Value Index · Redfin Data CenterHousing market →

Safety in Mountainside

A⁺

Safety Grade A+

Mountainside reports less crime per resident than 95% of the U.S. towns and cities we grade.

Violent crime per 1,000

Mountainside 0.1

New Jersey 2

U.S. 3.3

Property crime per 1,000

Mountainside 5.1

New Jersey 12.7

U.S. 15.5

FBI crime data, 2025 · crimes reported to policeCrime & safety →

Schools in Mountainside

All Mountainside schools →

A

School Grade A

The public schools Mountainside’s kids attend outperform 91% of New Jersey’s districts on state tests. Among towns with similar incomes, they rank near the top.

#48Best public schoolsof 457 in NJ

DistrictMountainside School DistrictSchools4

Beechwood SchoolElementary · Grades PK–2 · 265 students Primrose School at MountainsideElementary · Grades PK–K · 10 students Deerfield Elementary School AMiddle · Grades 3–8 · 483 students Kohler AcademyOther · Grades PK–12 · 46 students

School data from the U.S. Department of Education (NCES, EDFacts). The School Grade is our own summary of state test results, graded within NJ. Ratings are from neighbors.