Palo Alto California ZIP Codes

Palo Alto holds 6 ZIP codes, spread across 2 counties.

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Scope every ZIP code recorded for Palo Alto. 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 Palo Alto ZIP code begins 943. Those first three digits identify the sectional center facility that processes mail for this part of California. Statewide that range covers 7 ZIP codes, so Palo Alto accounts for 86% 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 code below serves the same ground Palo Alto occupies.

• 650 Area code 650

Palo Alto California area codes in full →

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