020 (UK DIALLING CODE)

(Redirected from 020)

Approximate coverage of 020 dial code, compared to Greater London boundary

'020' is the dial code for Greater London in the United Kingdom.

Coverage

Completely covered by 020

Partly covered by other codes

Outside Greater London covered by 020

Sub ranges

Allocation

History

Coverage

The code serves an area similar to Greater London, formerly known as the ''London Director Area''. Some outer districts are covered by sections of adjacent codes and in some places the 020 code extends beyond the Greater London boundary. The code covers an area larger than the London postal district.

Completely covered by 020

The City of London and the London boroughs of Barking and Dagenham, Barnet, Brent, Camden, Ealing, Enfield, Greenwich, Hackney, Hammersmith and Fulham, Haringey, Harrow, Hounslow, Islington, Kensington and Chelsea, Kingston upon Thames, Lambeth, Lewisham, Merton, Newham, Redbridge, Richmond upon Thames, Southwark, Sutton, Tower Hamlets, Waltham Forest, Wandsworth and the City of Westminster are more or less completely covered by the code.

Partly covered by other codes

Area code	Main exchange	London boroughs partly covered
01322	Dartford †	Bexley
01689	Orpington	Bromley and Croydon
01708	Romford	Havering
01753	Slough †	Hillingdon
01895	Uxbridge	Hillingdon
01923	Watford †	Hillingdon
01959	Westerham †	Bromley
01992	Waltham Cross †	Enfield

† = outside Greater London

Outside Greater London covered by 020

County	District	Places
Essex	Epping Forest	Loughton, Chigwell, Buckhurst Hill, Sewardstone
Hertfordshire	Hertsmere	Elstree, Borehamwood
Surrey	Elmbridge	Molesey, Thames Ditton
	Epsom and Ewell	Ewell
	Tandridge	Whyteleafe

Sub ranges

0xxx xxxx
1xxx xxxx

national dialling only, not issued locally

2xxx xxxx

future use

3xxx xxxx

new local numbers created by move to 020 (currently issued)

4xxx xxxx
5xxx xxxx
6xxx xxxx

future use

70xx xxxx
71xx xxxx

new local numbers created by move to 020

72xx xxxx
73xx xxxx
74xx xxxx
75xx xxxx
76xx xxxx
77xx xxxx
78xx xxxx
79xx xxxx

local numbers transferred from 0171

80xx xxxx
81xx xxxx

new local numbers created by move to 020

82xx xxxx
83xx xxxx
84xx xxxx
85xx xxxx
86xx xxxx
87xx xxxx
88xx xxxx
89xx xxxx

local numbers transferred from 0181

Allocation

59% of numbers within the 020 code are allocated to BT.^[1]

History

020 replaced the 0171 and 0181 codes on 22 April 2000, after a period of dual-running which began 1 June 1999. Before May 1990 there had been a single area code of 01 which covered the same area as the current 020 code. Before this date the three digits after the code indicated the geographic area the number was located. e.g. 01-222 1234 was a number in Westminster, and 01-946 1234 was in Wimbledon. However, more than one sub-code was usually overlaid for each area such that all Wimbledon numbers did not necessarily begin 01-946.

Between 1922 and 1966 the three digit sub-codes each corresponded to one area and were represented by letters by way of a mnemonic. The first exchange to become part of the London Director telephone system was Holborn. The numbers were written as ABBey 1234 and WIMbledon 1234. The system of mnemonics was withdrawn with the transition to all-figure dialling.

References

External links

★ List of exchanges in 1966

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