UK Area Code Finder
Quick and easy telephone dialling code information
029 is the telephone area code for Cardiff
All landline phone numbers beginning with the 029 area code, which includes those starting with 029 21, are for Cardiff.
The 029 area code at the beginning is optional; if you're dialling from one Cardiff landline phone to another you can dial just the eight-digit local phone number.
Cardiff has had the three-digit area code 029 since the year 2000. This is always followed by an eight-digit local number.
The correct way to write a Cardiff phone number is
During the year 2000, Cardiff's area code changed from 01222 to 029, while its old six-digit local phone numbers were prefixed with '20' to make them eight digits long.
The new system gives Cardiff nearly 80 million numbers: