US United States Major Regions Postal Code Details
🏛️ New Castle · Delaware
19810Arden
Arden new castle delaware 19810 United States
19897Astrazeneca
Astrazeneca new castle delaware 19897 United States
19886Bank Of America
Bank Of America new castle delaware 19886 United States
19701Bear
Bear new castle delaware 19701 United States
19809Bellefonte
Bellefonte new castle delaware 19809 United States
19734Blackbird
Blackbird new castle delaware 19734 United States
19893Chase Manhattan Bank N A
Chase Manhattan Bank N A new castle delaware 19893 United States
19702Christiana
Christiana new castle delaware 19702 United States
19718Christiana Medical Center
Christiana Medical Center new castle delaware 19718 United States
19721Citibank
Citibank new castle delaware 19721 United States
19703Claymont
Claymont new castle delaware 19703 United States
19706Delaware City
Delaware City new castle delaware 19706 United States
19895Delmarva Power
Delmarva Power new castle delaware 19895 United States
19898Dupont Inc
Dupont Inc new castle delaware 19898 United States
19810Edgemoor
Edgemoor new castle delaware 19810 United States
19805Elsmere
Elsmere new castle delaware 19805 United States
19884Greenville
Greenville new castle delaware 19884 United States
19707Hockessin
Hockessin new castle delaware 19707 United States
19708Kirkwood
Kirkwood new castle delaware 19708 United States
19720Manor
Manor new castle delaware 19720 United States
19808Marshallton
Marshallton new castle delaware 19808 United States
19709Middletown
Middletown new castle delaware 19709 United States
19720Minquadale
Minquadale new castle delaware 19720 United States
19710Montchanin
Montchanin new castle delaware 19710 United States
19720New Castle
New Castle new castle delaware 19720 United States
19716Newark
Newark new castle delaware 19716 United States
19804Newport
Newport new castle delaware 19804 United States
19730Odessa
Odessa new castle delaware 19730 United States
19731Port Penn
Port Penn new castle delaware 19731 United States
19732Rockland
Rockland new castle delaware 19732 United States
19733Saint Georges
Saint Georges new castle delaware 19733 United States
19725Shared Firm Zip
Shared Firm Zip new castle delaware 19725 United States
19804Stanton
Stanton new castle delaware 19804 United States
19803Talleyville
Talleyville new castle delaware 19803 United States
19734Townsend
Townsend new castle delaware 19734 United States
19893Wilmington
Wilmington new castle delaware 19893 United States
19890Wilmington Trust
Wilmington Trust new castle delaware 19890 United States
19735Winterthur
Winterthur new castle delaware 19735 United States
19736Yorklyn
Yorklyn new castle delaware 19736 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).
