Mountainside, NJ: Population, ZIP Codes & Nearby Cities

Mountainside, NJ is an incorporated town-sized municipality located in Union County in the state of New Jersey. Our data estimates 6,885 residents, places it at 40.681°N, 74.360°W, and lists it in Eastern time. This page explains its population rank, ZIP codes, nearby cities and distance to big metros.

What are the key facts about Mountainside, NJ?

What is the population of Mountainside, NJ?

Mountainside has an estimated population of 6,885. That makes it the 200th largest of the 508 places we list in New Jersey, and the 12th largest of 13 places in Union County. The typical place in New Jersey has about 4,722 residents, so Mountainside is roughly 1.5 times the size of a typical neighbor in the state.

Estimates for places of this size carry wider margins of error than those for big cities, so treat the figure as a guide to scale. Our guide to understanding city population numbers explains why sources disagree.

Places in New Jersey with a similar population include Keyport (6,977), Milltown (6,967), Stratford (6,955), Twin Rivers (6,870), Yardville (6,801). Comparing these pages is a quick way to see how Mountainside differs from communities of the same scale.

How dense is Mountainside?

Mountainside has about 1,722 people per square mile (665 per square kilometer), which we classify as suburban. Within New Jersey, it is denser than about 34% of the listed places. Land at this level is usually a mix of single-family neighborhoods, shopping corridors and parks, where driving is common but destinations are close. Read how to interpret population density to see how we draw these lines.

What ZIP codes does Mountainside use?

Mountainside uses one ZIP code: 07092. A single code usually means a compact delivery area, but the same code may also serve addresses just outside the town line. Codes beginning with 0 are assigned to the Northeast (New England, New Jersey and Puerto Rico). Learn more in our guide to how ZIP codes work or check any code with the ZIP code lookup.

What time zone is Mountainside in?

Mountainside is in the Eastern time zone, which is UTC−5 from Coordinated Universal Time in standard time (IANA zone America/New_York). The area observes daylight saving time, so clocks move forward in March and back in November. The nearest listed place in a different time zone is La Porte, IN, about 645 miles away, which gives a sense of how far the nearest zone boundary may be. Current local time: see the Eastern time hub. For the rules behind these zones, read US time zones explained.

Where is Mountainside located in New Jersey?

Mountainside lies in the northeastern part of New Jersey, at 40.681° north latitude and 74.360° west longitude. The state capital, Trenton, is about 38 miles to the southwest. The closest listed place in another state is Staten Island, NY, roughly 13 miles to the southeast, which shows how near Mountainside is to a state line. For big-city services, the nearest place with more than 100,000 people is Elizabeth, NJ, 9 miles to the east.

Which cities are near Mountainside, NJ?

The closest listed place to Mountainside is Westfield, NJ, 2.2 miles to the southeast. Of the eight nearest places below, 6 are in the same county. Distances are straight-line (great-circle) miles measured between place centers; see how distance is calculated.

Which county is Mountainside in?

Mountainside is in Union County, which has the Federal Information Processing Standards (FIPS) code 34039. The county contains 13 places in our data, 12 of which have their own page here and 1 smaller communities that appear only in county and state lists. Other places in the county include Elizabeth (129,216), Plainfield (50,317), Linden (42,361), Rahway (29,895), Westfield (29,512). Codes like this one help separate places that share a name; see the guide to counties and FIPS codes.

How far is Mountainside from major US cities?

Among six major hubs, Mountainside is closest to New York, NY at about 23 miles and farthest from Los Angeles, CA at about 2,434 miles in a straight line. Road distances are usually 10 to 30 percent longer. Try the distance calculator for any other pair.

Are there other places called Mountainside?

No. In our data, Mountainside in Union County, New Jersey is the only place with this name, so the name alone is enough to identify it, though adding the state is still good practice in addresses and forms.

Planning a move to Mountainside?

If you are weighing Mountainside, start with the practical numbers: how far it is from where you live, whether it changes your time zone, and how its size and density compare with your current city. Use the distance calculator to measure the trip from where you live. The radius search tool lists every place within any distance of it. Our checklist for comparing cities explains what to check next.

Where to go next

Population and density come from a compiled dataset and are estimates. They may differ from official Census Bureau counts. Verify important figures at census.gov.