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Find the telephone dialling codes for different areas and services in the United Kingdom, based on the official standard maintained by Ofcom. Learn the history and changes of the UK phone code system, from the international prefix 00 to the area codes 01, 02, and 03.
Learn about the structure, format and history of UK telephone numbers, including the country code 44 and the dialling codes for different regions and services. Find out how to call the UK from abroad and how to use the National Telephone Numbering Plan.
Find out the postcode area names, codes and number of postcode districts for each region in the UK and the Crown Dependencies. Learn how postcode areas are formed, subdivided and used by Royal Mail for mail delivery.
Find out the population of each postcode area in the UK based on the 2011 Census data. The postcode area is the largest geographical unit used by Royal Mail for mail delivery.
A postcode district is a group of postcode areas with the same alphabetical prefix. This web page provides a comprehensive list of postcode districts and their namesakes, post towns and former postal counties.
Learn how UK telephone numbers evolved from manual to automatic exchanges, from local codes to area codes, and from geographic to special services. The web page covers the origins, subscriber numbers, director system, and renumbering exercises of UK telephone numbers.
Find out the geographic codes for different areas of Wales, including Cardiff and the surrounding area with code 029. Learn the history and misconceptions of UK telephone numbering plan and dialling codes.
020 is the national dialing code for London in the United Kingdom, introduced in 2000 after multiple telephone number changes since 1990. Learn about the history, format, and coverage of the 020 area code and its predecessors, from the London telephone area to the Director system.