List of telephone exchanges in London

This is a list of telephone exchanges located within Greater London.[1]

Occasionally in areas of high demand two exchanges are located at the same premises, for example Canary Wharf and Poplar.

In earlier times telephone exchanges were given names, such as Ebsfleet; a caller would ask the operator for Ebsfleet 1234. When dialling was introduced, letters were marked on telephone dials and calls to numbers on the exchange started with the first three letters of the exchange name followed by four digits, as EUS 1234.[2] Letters were then dropped, but dialling remained the same for existing exchanges; "EUS" corresponded to 387, so that the number would be dialled 387 1234. Each GPO exchange had its own three-digit code, so that a 387- number was in the Euston area. The dialling sequence for the same exchange later became 01-387 1234, 071-387 1234, then 0171-387 1234, and finally 020-7387 1234.

As the telephone system was modernised and liberalised with multiple telephone companies, and numbers became portable the rigid correspondence of numeric codes to exchanges was relaxed, but even today it is likely that a (7)387 number, for example, is located in the Euston area. Lists of numbers allocated to BT exchanges in the UK, including London, are available online, and enable the exchange associated with a given number to be found, if applicable.[3] Locations of exchanges, given a postcode in their catchment area, are also documented.[1]

NOTE: The United Kingdom adopts an open dialling plan for area codes within its public switched telephone network. Therefore, all area codes have a preceding 0 (zero) when dialling from within the United Kingdom. When dialling a UK number from abroad the zero must not be included, but replaced by the calling country's international call prefix followed by the 44, the country code for the UK. Thus a call to the Euston exchange discussed above from the United States would be to 011 (US international prefix) 44 20 (London) 73871234.

OLO[a] codeExchange nameLondon boroughDial code
LWACTActonEaling020
LSADDAddiscombeCroydon020
LNADKAlbert DockNewham020
WRBATTBalhamWandsworth020
LNBKGBarkingBarking and Dagenham020
LNBARBarnetBarnet020
LSBALBatterseaWandsworth020
WEWBAYBayswaterWestminster020
LSBECBeckenhamBromley020
WRBELBelgraviaWestminster020
CLBERBermondseySouthwark020
LSBEUBeulah HillCroydon020
LSBEXBexleyheathBexley020
NDBHIBiggin HillBromley01959
CLBISBishopsgateCity of London020
WEWBLOBloomsburyCamden020
LNBPKBowes ParkHaringey020
WRBRIXBrixtonLambeth020
LSBROBromleyBromley020
LNCNWCanary WharfTower Hamlets020
CLCANCanonburyIslington020
LSCTFDCatfordLewisham020
WRCHELChelseaKensington and Chelsea020
LSCHESChessingtonKingston upon Thames020
LNCHFChingfordWaltham Forest020
LSCHIChislehurstBromley020
LWCHIChiswickHounslow020
LNCLAClaptonHackney020
CLCLEClerkenwellIslington020
LWCOLColindaleBarnet020
CLCOVCovent GardenWestminster020
LSCRAYCrayfordBexley01322
LWCRICricklewoodBarnet020
LNCEDCrouch EndHaringey020
LSCROCroydonCroydon020
LNDAGDagenhamBarking and Dagenham020
LWDENDenhamDenham01895
LSDEPDeptfordLewisham020
LSDOWDownlandCroydon01737
LSDULDulwichSouthwark020
LWEALEalingEaling020
WRECTEarls CourtKensington and Chelsea020
LWEDGEdgwareBarnet020
LNEDMEdmontonEnfield020
LSELTElthamGreenwich020
LNENFEnfieldEnfield020
LSERIErithBexley01322
CLEUSEustonCamden020
CLFARFaradayCity of London020
LSFARBFarnboroughBromley01689
LWFELFelthamHounslow020
LNFINFinchleyBarnet020
CLFLEFleetCity of London020
LSFORForest HillLewisham020
WRFULMFulhamHammersmith and Fulham020
LNGHLGants HillRedbridge020
LSGIPGipsy HillLambeth020
LWGOLGolders GreenBarnet020
LNGDMGoodmayesRedbridge020
LWGREGreenfordEaling020
LSGRNWGreenwichGreenwich020
LSGROGrove ParkLewisham020
LNHACHackneyHackney020
LWHAMHammersmithHammersmith and Fulham020
WEWHAMHampsteadCamden020
LWHAREHarefieldHillingdon01895
LWHARLHarlesdenBrent020
LWHARRHarrowHarrow020
LWHATHatch EndHarrow020
LSHAYHayes CommonBromley020
LWHAYHayes NorthHillingdon020
LWHENHendonBarnet020
LNHPKHighams ParkWaltham Forest020
CLHOLHolbornCamden020
LNHORHornchurchHavering01708
LWHOUHounslowHounslow020
LNILCIlford CentralRedbridge020
LNILNIlford NorthRedbridge020
LNINGIngrebourneHavering01708
LWISLIsleworthHounslow020
LWKGREKensal GreenWestminster020
WRKGDNKensington GardensKensington and Chelsea020
CLKENKentish TownCamden020
LWKROAKenton RoadHarrow020
LSKIDKidbrookeGreenwich020
CLKXXKings CrossCamden020
LWKINKingsburyBrent020
CLKLGKingsland GreenIslington020
LSKINKingstonKingston upon Thames020
LWKNEKneller HallRichmond upon Thames020
LSLEELee GreenLewisham020
LNLEYLeytonstoneWaltham Forest020
LSLODHLodge HillCroydon01689
WEWLORLordsWestminster020
CLLOWLower HollowayIslington020
WEWMAIMaida ValeCamden020
LSMALMaldenKingston upon Thames020
WEWMARMaryleboneWestminster020
WEWMAYMayfairWestminster020
LSMEPKMerton ParkMerton020
LNMEDMile EndTower Hamlets020
LWMILMill HillBarnet020
LSMITMitchamMerton020
LSMOLMoleseyRichmond upon Thames020
CLMONMonumentCity of London020
CLMOOMoorgateCity of London020
LSMORMortlakeRichmond upon Thames020
LNMUSMuswell HillHaringey020
CLNEWNew CrossLewisham020
LNNWSNew SouthgateBarnet020
WRNELMSNine ElmsWandsworth020
LSNORNorburyCroydon020
LSNCHMNorth CheamSutton020
LWNEDGNorth EdgwareBarnet020
LNNFNNorth FinchleyBarnet020
WEWNPNNorth PaddingtonWestminster020
LWNWEMNorth WembleyBrent020
LWNORNortholtEaling020
LWNWOONorthwoodHillingdon01923
LSORPOrpingtonBromley01689
WEWPADPaddingtonWestminster020
LNPGNPalmers GreenEnfield020
WRPGRNParsons GreenHammersmith and Fulham020
LWPERPerivaleEaling020
WRPIMPimlicoWestminster020
LWPINPinnerHarrow020
LNPONPonders EndEnfield020
LNPOPPoplarTower Hamlets020
WEWPRIPrimrose HillWestminster020
LSPURPurleyCroydon020
LSPUTPutneyWandsworth020
LNRAIRainhamHavering01708
LSRICRichmond KewRichmond upon Thames020
LNROMRomfordHavering01708
LWRUIRuislipHillingdon01895
LSRUSRushey GreenLewisham020
LSSANSandersteadCroydon020
LWSHEShepherds BushHammersmith and Fulham020
CLSHOShoreditchHackney020
LSSIDSidcupBexley020
LWSKYSkyportHillingdon020
LSSLASlade GreenBexley01322
WRSLOSloaneKensington and Chelsea020
WEWSOHSoho (Gerrard Street)Westminster020
LSCLPMSouth ClaphamWandsworth020
LWSHARSouth HarrowHarrow020
WRSKENSouth KensingtonKensington and Chelsea020
LWSOUSouthallEaling020
WRSTHBKSouthbankSouthwark020
CLSOUSouthwarkSouthwark020
LNSTAStamford HillHackney020
LWSTANStanmoreHarrow020
CLSTEStepney GreenTower Hamlets020
LNSTFStratfordNewham020
LSSTRStreathamLambeth020
LSSURSurbitonKingston upon Thames020
LSSUTSutton CheamSutton020
LSSYDSydenhamBromley020
LSTEDTeddingtonRichmond upon Thames020
LSTHMDThamesmeadGreenwich020
LSTHOThornton HeathCroydon020
LNTOTTottenhamHaringey020
LSTULTulse HillLambeth020
LWTWITwickenhamRichmond upon Thames020
LNUPMUpminsterHavering01708
CLUPPUpper HollowayIslington020
LNUPKUpton ParkNewham020
LWUXBUxbridgeHillingdon01895
WRVAUXVauxhallLambeth020
LSWALWallingtonSutton020
LNWTHWalthamstowWaltham Forest020
CLWALWalworthSouthwark020
LSWANWandsworthWandsworth020
LNWSDWansteadRedbridge020
CLWAPWappingTower Hamlets020
LWWEMWembleyBrent020
LWWDRAWest DraytonHillingdon01895
WRWKENWest KensingtonHammersmith and Fulham020
LSWWKMWest WickhamBromley020
WRWMINWestminsterWestminster020
WRWHIWhitehallWestminster020
LWWILWillesdenBrent020
LSWIMWimbledonMerton020
LNWINWinchmore HillEnfield020
CLWOOWood StreetCity of London020
LNWFDWoodfordRedbridge020
LSWOOWoolwichGreenwich020
LSWORWorcester ParkSutton020

The following exchanges are located outside Greater London, but use the London 020 dial code.

OLO[4] codeExchange nameDistrict, CountyDial code
LWBUSBushey HeathHertsmere, Hertfordshire020
LWELSElstreeHertsmere, Hertfordshire020
LNHAIHainaultEpping Forest, Essex020
LSEWEEwellEpsom and Ewell, Surrey020
LNLOULoughtonEpping Forest, Essex020
LSTHDTThames DittonElmbridge, Surrey020

Automatic exchanges

London manual exchanges were gradually converted to Director automatic exchanges from 1927. Holborn was the first, at midnight on Saturday 12 November, a local and tandem exchange. Bishopgate and Sloane exchanges followed in six weeks, then Western and Monument exchanges. The London area contained 80 exchanges, and full conversion was to take many years.[5]