GB United Kingdom Major Regions Postal Code Details
🏛️ Cardiff (caerdydd) · Wales
CF10 3EA
Blackweir
CF83 1NG
Blaengwynlais
CF11 8EG
Canton
CF5 6JN
Capel Llanilltern
CF10 4EQ
Cardiff
CF10 4EW
Docks
CF5 4AA
Ely
CF5 3DP
Fairwater
CF14 3LE
Gabalfa
CF11 6RY
Grangetown
CF15 9HJ
Gwaelod-Y-Garth
CF14 4PP
Heath
CF14 0XE
Lisvane
CF5 2PB
Llandaff
CF14 2AZ
Llandaff North
CF23 9EP
Llanedeyrn
CF14 5EE
Llanishen
CF3 5QW
Llanrumney
CF14 3AP
Maindy
CF15 8LQ
Morganstown
CF3 6XA
Old Saint Mellons
CF14 7TQ
Pantmawr
CF23 7XH
Pentwyn
CF15 9QP
Pentyrch
CF23 9EY
Penylan
CF23 8QB
Pontprennau
CF15 8DP
Radyr
CF14 6LL
Rhiwbina
CF24 3AN
Roath
CF3 4AT
Rumney
CF5 6FS
Saint Fagans
CF3 0EF
Saint Mellons
CF24 2BF
Splott
CF14 9DN
Thornhill
CF15 7NL
Tongwynlais
CF24 5SD
Tremorfa
CF14 1PZ
Whitchurch
📮GB United Kingdom Regional Postal Code FAQ & Postal Regulations
📮 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).