US United States Major Regions Postal Code Details
🏛️ Contra Costa · California
94507Alamo
Alamo contra costa california 94507 United States
94509Antioch
Antioch contra costa california 94509 United States
94565Bay Point
Bay Point contra costa california 94565 United States
94511Bethel Island
Bethel Island contra costa california 94511 United States
94506Blackhawk
Blackhawk contra costa california 94506 United States
94513Brentwood
Brentwood contra costa california 94513 United States
94553Briones
Briones contra costa california 94553 United States
94514Byron
Byron contra costa california 94514 United States
94516Canyon
Canyon contra costa california 94516 United States
94529Chevron
Chevron contra costa california 94529 United States
94529Chevron Usa Inc
Chevron Usa Inc contra costa california 94529 United States
94517Clayton
Clayton contra costa california 94517 United States
94520Clyde
Clyde contra costa california 94520 United States
94519Concord
Concord contra costa california 94519 United States
94525Crockett
Crockett contra costa california 94525 United States
94506Danville
Danville contra costa california 94506 United States
94528Diablo
Diablo contra costa california 94528 United States
94505Discovery Bay
Discovery Bay contra costa california 94505 United States
94530El Cerrito
El Cerrito contra costa california 94530 United States
94820El Sobrante
El Sobrante contra costa california 94820 United States
94547Hercules
Hercules contra costa california 94547 United States
94806Hilltop Mall
Hilltop Mall contra costa california 94806 United States
94548Knightsen
Knightsen contra costa california 94548 United States
94549Lafayette
Lafayette contra costa california 94549 United States
94553Martinez
Martinez contra costa california 94553 United States
94570Moraga
Moraga contra costa california 94570 United States
94801North Richmond
North Richmond contra costa california 94801 United States
94561Oakley
Oakley contra costa california 94561 United States
94563Orinda
Orinda contra costa california 94563 United States
94553Pacheco
Pacheco contra costa california 94553 United States
94564Pinole
Pinole contra costa california 94564 United States
94565Pittsburg
Pittsburg contra costa california 94565 United States
94523Pleasant Hill
Pleasant Hill contra costa california 94523 United States
94801Point Richmond
Point Richmond contra costa california 94801 United States
94565Port Chicago
Port Chicago contra costa california 94565 United States
94569Port Costa
Port Costa contra costa california 94569 United States
94850Richmond
Richmond contra costa california 94850 United States
94572Rodeo
Rodeo contra costa california 94572 United States
94803San Pablo
San Pablo contra costa california 94803 United States
94583San Ramon
San Ramon contra costa california 94583 United States
94806Tara Hills
Tara Hills contra costa california 94806 United States
94596Walnut Creek
Walnut Creek contra costa california 94596 United States
94565West Pittsburg
West Pittsburg contra costa california 94565 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).
