United Kingdom Postal Code Details

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.

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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.

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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.

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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 Kingdom Postal FAQ and delivery guidance

📮 What is the basic format of a UK postcode?

A UK postcode consists of 5-7 alphanumeric characters, split into two parts: the outward code (area and district) and inward code (specific street/building). Examples: SW1A 1AA (London) or M1 1AE (Manchester).

🔍 How to find or validate a UK postcode?

Use Royal Mail's free Postcode Finder tool on their official website to search by address, or third-party APIs for validation.

⚠️ What happens if I write a wrong postcode?

Incorrect postcodes may cause delays, returns, or lost mail. For important items, use Tracked services and double-check the recipient's postcode.

📬 Is a postcode mandatory for UK mail?

Yes! Postcodes are essential. Mail without a postcode or with errors faces significant delivery issues. Always write the postcode on a separate line at the end of the address (e.g., London SW1A 1AA).