Boston Massachusetts ZIP Codes

Boston holds 36 ZIP codes, spread across 2 counties and 2 postal prefixes.

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Scope every ZIP code recorded for Boston. 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.

Those first three digits identify the sectional center facility that processes mail for a region, and Boston does not sit inside just one of them: its codes are split between 2 prefixes, so the city is served by more than one processing centre.

Every Massachusetts 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 Boston occupies.

• 339 Area code 339
• 351 Area code 351
• 508 Area code 508
• 617 Area code 617
• 774 Area code 774
• 781 Area code 781
• 857 Area code 857
• 978 Area code 978

Boston Massachusetts area codes in full →

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