Mountainside, New Jersey
Borough in Union County, New Jersey
| Census | Population |
|---|---|
| 2000 | 6,602 |
| 2010 | 6,685 |
| 2020 | 7,020 |
As counted at each census, within the boundaries the area had then; the current estimate is in the glance card.
Sources: Census 2000 Summary File 1: total population, place level, state 34, retrieved November 14, 2026; Census 2010 Summary File 1: total population, place level, state 34, retrieved November 14, 2026; Census 2020 Redistricting Data (P.L. 94-171): total population, place level, state 34, retrieved November 14, 2026.
| Measure | Mountainside | Union County | New Jersey |
|---|---|---|---|
| Population | 6,967 | 572,549 | 9,267,014 |
| Median household income | $210,100 | $100,117 | $101,050 |
| Median age | 48.7 | 39.1 | 40.1 |
| Median home value | $755,600 | $488,800 | $427,600 |
| Bachelor’s degree or higher | 66.2% | 38.6% | 42.9% |
| Foreign-born residents | 18.5% | 32.8% | 23.5% |
| Owner-occupied homes | 86.9% | 57.6% | 63.7% |
| Mean commute to work | 38.9 minutes | 30.7 minutes | 30.9 minutes |
Source: American Community Survey 5-year data profile 2019–2023, place level, state 34, retrieved November 14, 2026.
Median household income $210,100 · Share of households by income, American Community Survey 5-year 2019-2023, table S1901.
Source: American Community Survey 5-year subject table S1901 (household income) 2019–2023, place level, state 34, retrieved November 14, 2026.
- Owner occupied
- 2,206 units
- Renter occupied
- 334 units
- Vacancy rate
- 2.9%
Occupied housing units by tenure and the share of all units vacant, American Community Survey 5-year 2019-2023, table DP04.
Source: American Community Survey 5-year data profile 2019–2023, place level, state 34, retrieved November 14, 2026.
| School | Type | Grades | District |
|---|---|---|---|
| Beechwood School | Public | Pre-K–2 | Mountainside School District |
| Deerfield Elementary School | Public | 3–8 | Mountainside School District |
Open public schools in the NCES directory for 2023–2024, placed by their listed location; private schools are not in the source. Enrollment and ratings are not shown.
Sources: NCES Common Core of Data, public school directory 2023–2024, retrieved November 14, 2026; NCES EDGE public school geocodes 2024–2025, retrieved November 14, 2026.
Community
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Nearby towns
- Springfield TownshipTownship
- WestfieldTown
- SummitCity
- New ProvidenceBorough
- GarwoodBorough
- FanwoodBorough
- SpringfieldCensus designated place
- CranfordCensus designated place
- Berkeley Heights TownshipTownship
- Scotch Plains TownshipTownship
Other towns in Union County
- Berkeley Heights TownshipTownship
- Clark TownshipTownship
- Connecticut FarmsCensus designated place
- Cranford TownshipTownship
- CranfordCensus designated place
- ElizabethCity
- FanwoodBorough
- GarwoodBorough
- Hillside TownshipTownship
- Kean UniversityCensus designated place
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- Type
- Borough
- County
- Union County
- Land area
- 4.00 sq mi
- Water area
- 0.05 sq mi
- Population
- 7,228 (2024 estimate)
- Households
- 2,540
- Median age
- 48.7
- Median household income
- $210,100
- Median home value
- $755,600
- Median gross rent
- $3,501
- Owner-occupied homes
- 86.9%
- Bachelor’s degree or higher
- 66.2%
- Foreign-born residents
- 18.5%
- Mean commute to work
- 38.9 minutes
- Census GEOID
- 3448510
Sources: Census Gazetteer 2025: places, retrieved November 14, 2026; Census Population Estimates, Vintage 2024: subcounty totals, state 34, retrieved November 14, 2026; American Community Survey 5-year data profile 2019–2023, place level, state 34, retrieved November 14, 2026.
- ZIP codes
- 07092
- Metro area
- New York-Newark-Jersey City, NY-NJ
Sources: Census 2020 ZCTA relationship file: ZCTAs to places, retrieved November 14, 2026; Census Gazetteer 2025: metropolitan and micropolitan areas, retrieved November 14, 2026.