Mountainside is a borough in Union County, New Jersey, home to about 7,049 people across 4.0 square miles. Its ZIP code is 07092.
Homes sold for a median of $543 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Mountainside. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Mountainside’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Newark Liberty International Airport (EWR)10 miles away |
|---|---|
| Nearest city of 250,000+ | Newark, NJ10 miles away |
| Nearest city of 1 million+ | New York, NY22 miles away |
Straight-line distances from the center of Mountainside; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Mountainside had 7,020 residents in the 2020 census, up 6% since 2000.
It’s the 319th largest of 565 towns in New Jersey by population.
Union County grew from 99,353 residents in 1900 to 575,345 in 2020.
Union County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 25°F. About 50.4 inches of rain and melted snow fall in a typical year, with about 26 inches of snow.
Source: NOAA 1991–2020 climate normals, Cranford, NJ weather station (2 miles away).
208,505 jobs at 14,276 businesses in Union County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
216 doctors and other health care providers list an office in Mountainside.
Nearest hospitals
Providers with an office here
| Primary care doctors | 5 |
|---|---|
| Specialist doctors | 29 |
| Dentists | 15 |
| Nurse practitioners and physician assistants | 20 |
| Mental health providers | 62 |
| Physical and occupational therapists | 80 |
| Chiropractors | 5 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (5 nearby)
Grocery stores
Pharmacies
Libraries (1 nearby)
Museums (3 nearby)
Theaters and performance venues
Counts are within about 1.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Mountainside School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Beechwood SchoolMountainside | Pre-K–2 | 265 | Public | 0.7 mi |
| Deerfield Elementary SchoolMountainside | 3–8 | 483 | Public | 0.5 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Kohler AcademyMountainside | Pre-K–12 | 40 | Nonsectarian | 1.0 mi |
| Primrose School at MountainsideMountainside | Pre-K–K | 5 | Nonsectarian | 1.4 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.