Key Biscayne Florida ZIP Codes

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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Scope every ZIP code recorded for Key Biscayne. 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 Key Biscayne ZIP code begins 331. Those first three digits identify the sectional center facility that processes mail for this part of Florida. Statewide that range covers 83 ZIP codes, so Key Biscayne accounts for 1% of it.

Every Florida 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 Key Biscayne occupies.

• 305 Area code 305
• 645 Area code 645
• 786 Area code 786

Key Biscayne Florida area codes in full →

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