South San Francisco California ZIP Codes

South San Francisco holds 2 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 South San Francisco codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for South San Francisco. 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 South San Francisco ZIP code begins 940. Those first three digits identify the sectional center facility that processes mail for this part of California. Statewide that range covers 45 ZIP codes, so South San Francisco accounts for 4% of it.

Every California 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 South San Francisco occupies.

• 415 Area code 415
• 628 Area code 628
• 650 Area code 650

South San Francisco California area codes in full →

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