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Mountainside
City in New Jersey, United States
Overview
Mountainside is a picturesque borough located in Union County, New Jersey, known for its tranquil suburban atmosphere and proximity to lush parks. With a small-town feel and easy access to major highways, it's a popular choice for families and commuters seeking a peaceful lifestyle near New York City.
Geographic Context
Jurisdiction
United States
State
New Jersey
Population
7,020
Time Zone
America/New_York
Coordinates
40.67°, -74.36°
Key Metrics
Safety Score
89
Female Safety
87
LGBTQ+ Safety
88
Traffic Safety
82
Food Safety
98
Monthly Cost
$3,475
Local Cost
$2,500
Local Income
$5,000
Cashless
95
English
100
Temperature
11.7°C
Summer Avg
23.1°C
Winter Avg
0.3°C
Record High
38.7°C
Record Low
-19.5°C
Humidity
79%
Precipitation
1226 mm
Internet Speed
305 Mbps
Upload
197 Mbps
Latency
7 ms
City Vibrancy
5
Coworking
0
Cafes
0
Nightlife
2
Parks
3
Transport
13
Walk Score
13
Footways
25.0
Airport
LDJ
Distance
11 km
Explore
Frequently Asked Questions
Data sources
Source-backed data
NASA POWER - Climate normals and monthly weather measurements rendered as city weather metrics. Updated 2026-03-22.
World Air Quality Index - Latest available city-level air quality station measurement. Updated 2025-12-05.
Ookla Open Data - Internet speed aggregates for 2024Q3 from 21 tests. Updated 2025-12-05.
OpenStreetMap - Nearby amenities counted from OpenStreetMap-derived city extracts. Updated 2025-12-07.
OpenStreetMap transport extract - Walkability, footway density, and airport access metrics derived from mapped transport features. Updated 2025-12-06.
Oyster List city price model - City price estimates calibrated from local price surveys and jurisdiction-level cost signals. Updated 2026-01-14.
Estimated data
Oyster List AI-assisted estimates - Safety, lifestyle, income, and practical scores are model-assisted estimates derived from source-backed country and city signals. Confidence 84/100.
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