Irwin Pennsylvania ZIP Codes
Irwin holds a single ZIP code.
Every ZIP code in Irwin
| ZIP code | County |
|---|---|
| 15642 | Westmoreland 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Irwin codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Irwin. 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 Irwin ZIP code begins 156. Those first three digits identify the sectional center facility that processes mail for this part of Pennsylvania. Statewide that range covers 77 ZIP codes, so Irwin accounts for 1% of it.
Every Pennsylvania ZIP prefix and the region it covers →
Area codes covering Irwin
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Irwin occupies.
Irwin Pennsylvania area codes in full →
Where Irwin's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Irwin
| City | Distance | ZIP codes |
|---|---|---|
| Manor Pennsylvania ZIP codes | 2.2 mi | 1 ZIP code |
| Adamsburg Pennsylvania ZIP codes | 2.5 mi | 1 ZIP code |
| Penn Pennsylvania ZIP codes | 3.0 mi | 1 ZIP code |
| Jeannette Pennsylvania ZIP codes | 4.5 mi | 1 ZIP code |
| Arona Pennsylvania ZIP codes | 4.6 mi | 1 ZIP code |
| Trafford Pennsylvania ZIP codes | 5.1 mi | 1 ZIP code |
| Madison Pennsylvania ZIP codes | 5.6 mi | 1 ZIP code |
| Pitcairn Pennsylvania ZIP codes | 7.0 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.