Mountainside
Borough in Union County, New Jersey

Mountainside is a borough in Union County, New Jersey, with 7,020 residents (2020 Census). It sits at 233 ft (71 m) above sea level. The nearest town is Springfield, 1.8 miles NE.
- 7,020residents (2020 Census)
- 233 ftelevation · 71 m
- 4.0 sq miland area · 10.4 km²
- 1,757 / sq mipopulation density
- 07092main ZIP code (2 in total)
About Mountainside
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 live in its 2008 rankings of the "Best Places To Live" in New Jersey, as well as eighth in the 2010 list.
Text: Wikipedia · CC BY-SA 4.0
Mountainside weather: 7-day forecast
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Source: National Weather Service (NOAA).
Live webcams in Mountainside
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Living in Mountainside
- Median household income
- $211,538
- Median home value
- $810,300
- Median rent
- $3,501/mo
- Median age
- 48
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Map of Mountainside
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Open in Google Maps ›Mountainside, NJ population
Mountainside had 7,020 residents in the 2020 Census.
| 2020 Census | 7,020 |
|---|---|
| Density | 1,757 per sq mi (678 per km²) |
Source: U.S. Census Bureau, Decennial Census.
Mountainside at a glance
| State | New Jersey (NJ) |
|---|---|
| County | Union County |
| Type | Borough |
| Population | 7,020 (2020) |
| Land area | 4.00 sq mi (10.4 km²) |
| Water area | 0.05 sq mi (0.12 km²) |
| Elevation | 233 ft (71 m) |
| Coordinates | 40.6807° N, 74.3603° W |
| ZIP codes | 07092, 07081 |
| Official website | mountainside-nj.com |
| Census code (GEOID) | 3448510 |
Sources: U.S. Census Bureau (Gazetteer, ZCTA), USGS GNIS, Wikidata.
Towns near Mountainside
- Springfield1.8 mi NE
- Westfield2.2 mi SE
- Summit2.4 mi N
- New Providence2.7 mi NW
- Garwood2.8 mi SE
- Fanwood3.0 mi SW
- Berkeley Heights3.3 mi W
- Scotch Plains3.4 mi S
- Cranford3.4 mi SE
- Kenilworth3.8 mi E
- Chatham4.3 mi N
- Short Hills4.4 mi NE
Straight-line distance between town centers.
Frequently asked questions about Mountainside
What county is Mountainside in?
Mountainside is in Union County, New Jersey.
What is the population of Mountainside, NJ?
7,020 people lived in Mountainside at the 2020 Census.
What is the ZIP code of Mountainside, NJ?
The main ZIP code is 07092. Other ZIP codes: 07081.
What is the elevation of Mountainside?
233 feet (71 m) above sea level.
What towns are near Mountainside?
Springfield (1.8 mi), Westfield (2.2 mi), Summit (2.4 mi), New Providence (2.7 mi), Garwood (2.8 mi).
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