Duncannon Pennsylvania ZIP Codes

Duncannon holds a single ZIP code.

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Scope every ZIP code recorded for Duncannon. 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 Duncannon ZIP code begins 170. Those first three digits identify the sectional center facility that processes mail for this part of Pennsylvania. Statewide that range covers 92 ZIP codes, so Duncannon accounts for 1% 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 Duncannon occupies.

• 223 Area code 223
• 717 Area code 717

Duncannon Pennsylvania area codes in full →

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