Mountainside
URL: https://knowledge.ivjn.us/en/places/nj-mountainside.html

Mountainside is a town in New Jersey, United States.

## Overview

Mountainside is a town in [New Jersey](https://knowledge.ivjn.us/en/places/new-jersey.html), United States, with a population of about 6,885[^geonames].

## Geography

- Coordinates: 40.6723, -74.3574

Updated: 2026-10-29

Relations:
- Located in: Union County https://knowledge.ivjn.us/en/places/nj-union-county.html

Sources:
- GeoNames US dataset (US.txt / admin2Codes.txt) https://download.geonames.org/export/dump/US.zip