UK Area Code information for 020
London Area Code AllocationOfcom has allocated the 020 area code to service London and the surrounding area on at least 242 exchanges. The 020 range is actually made up of 5 smaller number blocks starting; 0200, 0201, 0203, 0207 and 0208. These additional ranges allow numbers to be associated with London but are not necessarily numbers connected to physical phones in properties in the London area.
The Residential Area of London
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London comprises postcodes covering roughly 1,738,452km2 containing 216,478 commercial properties and 3,770,006 domestic properties.