New Castle Pennsylvania ZIP Codes

New Castle holds 6 ZIP codes, all inside one county and one postal prefix.

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 New Castle codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for New Castle. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

Every New Castle ZIP code begins 161. Those first three digits identify the sectional center facility that processes mail for this part of Pennsylvania. Statewide that range covers 45 ZIP codes, so New Castle accounts for 13% of it.

Every Pennsylvania ZIP prefix and the region it covers →

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 New Castle occupies.

• 724 Area code 724
• 878 Area code 878

New Castle Pennsylvania area codes in full →

Straight-line distance between place reference points, not driving distance.