San Carlos California ZIP Codes
San Carlos holds a single ZIP code.
Every ZIP code in San Carlos
| ZIP code | County |
|---|---|
| 94070 | San Mateo County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 San Carlos codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for San Carlos. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every San Carlos 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 San Carlos accounts for 2% of it.
Every California ZIP prefix and the region it covers →
Area codes covering San Carlos
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 San Carlos occupies.
San Carlos California area codes in full →
Where San Carlos's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near San Carlos
| City | Distance | ZIP codes |
|---|---|---|
| Belmont California ZIP codes | 1.8 mi | 1 ZIP code |
| Redwood City California ZIP codes | 3.2 mi | 5 ZIP codes |
| Atherton California ZIP codes | 4.7 mi | 1 ZIP code |
| San Mateo California ZIP codes | 4.8 mi | 5 ZIP codes |
| Menlo Park California ZIP codes | 6.7 mi | 2 ZIP codes |
| Burlingame California ZIP codes | 8.2 mi | 2 ZIP codes |
| Portola Valley California ZIP codes | 9.4 mi | 1 ZIP code |
| Half Moon Bay California ZIP codes | 9.7 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.