US United States Major Regions Postal Code Details
🏛️ San Mateo · California
94027Atherton
Atherton san mateo california 94027 United States
94002Belmont
Belmont san mateo california 94002 United States
94005Brisbane
Brisbane san mateo california 94005 United States
94010Burlingame
Burlingame san mateo california 94010 United States
94014Colma
Colma san mateo california 94014 United States
94016Daly City
Daly City san mateo california 94016 United States
94018El Granada
El Granada san mateo california 94018 United States
94062Emerald Hills
Emerald Hills san mateo california 94062 United States
94404Foster City
Foster City san mateo california 94404 United States
94019Half Moon Bay
Half Moon Bay san mateo california 94019 United States
94010Hillsborough
Hillsborough san mateo california 94010 United States
94020La Honda
La Honda san mateo california 94020 United States
94021Loma Mar
Loma Mar san mateo california 94021 United States
94026Menlo Park
Menlo Park san mateo california 94026 United States
94030Millbrae
Millbrae san mateo california 94030 United States
94037Montara
Montara san mateo california 94037 United States
94038Moss Beach
Moss Beach san mateo california 94038 United States
94044Pacifica
Pacifica san mateo california 94044 United States
94062Palomar Park
Palomar Park san mateo california 94062 United States
94060Pescadero
Pescadero san mateo california 94060 United States
94028Portola Valley
Portola Valley san mateo california 94028 United States
94497Postal Data Center
Postal Data Center san mateo california 94497 United States
94019Princeton By The Sea
Princeton By The Sea san mateo california 94019 United States
94065Redwood City
Redwood City san mateo california 94065 United States
94066San Bruno
San Bruno san mateo california 94066 United States
94070San Carlos
San Carlos san mateo california 94070 United States
94128San Francisco
San Francisco san mateo california 94128 United States
94128San Francisco Intnl Airport
San Francisco Intnl Airport san mateo california 94128 United States
94074San Gregorio
San Gregorio san mateo california 94074 United States
94403San Mateo
San Mateo san mateo california 94403 United States
94044Sharp Park
Sharp Park san mateo california 94044 United States
94080South San Francisco
South San Francisco san mateo california 94080 United States
94025West Menlo Park
West Menlo Park san mateo california 94025 United States
94061Woodside
Woodside san mateo california 94061 United States
📋 United States Address and Delivery Guidance
📮
Use a Complete Delivery Address:
Include the recipient name, building or street address, locality, region where applicable, postal code when the destination uses one, and the destination country or territory.
🌍
Follow Local Address Conventions:
Use the language, character set and address order requested by the recipient, official postal operator or carrier. Do not assume every destination uses the same postal-code format.
✅
Verify Before Dispatch:
Confirm the postal code, service coverage and any customs or carrier requirements with the recipient and the relevant official postal operator before shipping.
💡
Delivery Information Is Context-Specific:
Postal codes help routing only in territories that use them. Accurate recipient details remain essential for delivery in every destination.
Postal information, sources and verification
Use this page as a routing reference and confirm the complete address, postal code format and delivery restrictions with the relevant official postal operator or carrier before dispatch.
Editorial and service accountability
This postal-code reference is maintained by the 56ok.com logistics-content team for international shipping preparation. It is reviewed against publicly available postal-operator information; it is not an official postal authority and does not replace carrier or customs instructions.
This reference is maintained as postal and carrier information changes. Need a correction? Contact our team.
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📮United States Postal FAQ and delivery guidance
📮 What is the format of a US ZIP code?
Standard format is 5 digits (e.g., 10001). Extended format is ZIP+4 (9 digits like 10001-1234) with a hyphen.
🔍 How to find the ZIP code for an address?
Use the USPS ZIP Code Lookup tool by entering the full address on the official USPS website.
⚠️ What happens if I use a wrong ZIP code?
Mail may be delayed, returned, or lost. For important documents, use USPS tracking and verify the ZIP code.
🔄 Do ZIP codes ever change?
Yes, USPS may update ZIP codes due to regional adjustments. Always confirm your ZIP code after an address change.
📦 Is a ZIP code required for international mail to the US?
Absolutely. Always include the US ZIP code at the end of the address (e.g., New York, NY 10001 USA).
