Mountainside New Jersey ZIP Codes
Mountainside holds a single ZIP code.
Every ZIP code in Mountainside
| ZIP code | County |
|---|---|
| 07092 | Union County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Mountainside codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Mountainside. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Mountainside ZIP code begins 070. Those first three digits identify the sectional center facility that processes mail for this part of New Jersey. Statewide that range covers 88 ZIP codes, so Mountainside accounts for 1% of it.
Every New Jersey ZIP prefix and the region it covers →
Area codes covering Mountainside
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground Mountainside occupies.
Mountainside New Jersey area codes in full →
Where Mountainside's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Mountainside
| City | Distance | ZIP codes |
|---|---|---|
| Westfield New Jersey ZIP codes | 2.2 mi | 2 ZIP codes |
| Summit New Jersey ZIP codes | 2.4 mi | 2 ZIP codes |
| New Providence New Jersey ZIP codes | 2.7 mi | 1 ZIP code |
| Garwood New Jersey ZIP codes | 2.8 mi | 1 ZIP code |
| Fanwood New Jersey ZIP codes | 3.0 mi | 1 ZIP code |
| Kenilworth New Jersey ZIP codes | 3.8 mi | 1 ZIP code |
| Chatham New Jersey ZIP codes | 4.3 mi | 1 ZIP code |
| Watchung New Jersey ZIP codes | 4.8 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.