SW1Y 4 postcode sector in the SW1Y district

SW1Y 4 is a sector of the SW1Y district: every postcode that starts SW1Y 4. It has 71 postcodes in use, 13 of them large-user postcodes. A large-user postcode is one Royal Mail gives to a single address that gets a lot of mail.

Not sure what a sector is? UK postcode format explained.

Every postcode in the SW1Y 4 sector, by gigabit broadband

Map of every postcode in the SW1Y 4 sector, by gigabit broadband Of the 71 postcodes in the SW1Y 4 sector that ONS places, 8 have some that can, 58 can all get it and 5 have no Ofcom figure. Places named: St James's. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A4201A4A400 SW1Y 4JY: no Ofcom figureSW1Y 4UJ: no Ofcom figureSW1Y 4AA: gigabit for allSW1Y 4AD: gigabit for allSW1Y 4AE: gigabit for allSW1Y 4AN: gigabit for allSW1Y 4AR: gigabit for allSW1Y 4AU: gigabit for allSW1Y 4BE: gigabit for allSW1Y 4BN: gigabit for allSW1Y 4DG: gigabit for allSW1Y 4DL: gigabit for allSW1Y 4DN: gigabit for allSW1Y 4DP: gigabit for allSW1Y 4EA: gigabit for allSW1Y 4EE: gigabit for allSW1Y 4EL: gigabit for allSW1Y 4EN: gigabit for allSW1Y 4EX: gigabit for allSW1Y 4HA: gigabit for allSW1Y 4HE: gigabit for allSW1Y 4HT: gigabit for allSW1Y 4HX: gigabit for allSW1Y 4JE: gigabit for allSW1Y 4JH: gigabit for allSW1Y 4JR: gigabit for allSW1Y 4JS: gigabit for allSW1Y 4JZ: gigabit for allSW1Y 4LE: gigabit for allSW1Y 4LG: gigabit for allSW1Y 4LH: gigabit for allSW1Y 4NB: gigabit for allSW1Y 4NQ: gigabit for allSW1Y 4NW: gigabit for allSW1Y 4PD: gigabit for allSW1Y 4PE: gigabit for allSW1Y 4PH: gigabit for allSW1Y 4QL: gigabit for allSW1Y 4QN: gigabit for allSW1Y 4QQ: gigabit for allSW1Y 4QU: gigabit for allSW1Y 4QX: gigabit for allSW1Y 4RF: gigabit for allSW1Y 4RG: gigabit for allSW1Y 4RJ: gigabit for allSW1Y 4RL: gigabit for allSW1Y 4RP: gigabit for allSW1Y 4RW: gigabit for allSW1Y 4SP: gigabit for allSW1Y 4TE: gigabit for allSW1Y 4UF: gigabit for allSW1Y 4UH: gigabit for allSW1Y 4UR: gigabit for allSW1Y 4UY: gigabit for allSW1Y 4XA: gigabit for allSW1Y 4QF: gigabit for allSW1Y 4AH: some gigabitSW1Y 4AJ: some gigabitSW1Y 4BP: some gigabitSW1Y 4HG: some gigabitSW1Y 4HH: some gigabitSW1Y 4LB: some gigabitSW1Y 4LR: some gigabitSW1Y 4SQ: some gigabit St James's Map of every postcode in the SW1Y 4 sector, by gigabit broadband Of the 71 postcodes in the SW1Y 4 sector that ONS places, 8 have some that can, 58 can all get it and 5 have no Ofcom figure. Places named: St James's. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. St James's
  • No home or business can get gigabit: 0
  • Some can get gigabit: 8
  • Every home and business can get gigabit: 58
  • Ofcom gives no figure: 5

Of the 71 postcodes in the SW1Y 4 sector that ONS places, 8 have some that can, 58 can all get it and 5 have no Ofcom figure.

Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. No boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode. Names in italics are council wards: we hold no town or village names here.

Sources: ONS Postcode Directory, August 2026, loaded 20 October 2026; Ofcom Connected Nations, Connected Nations, Spring 2026; roads, rivers and built-up areas: Ordnance Survey open maps. Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre.

Postcodes in SW1Y 4

Pick a postcode to see its council and MP, broadband, flood risk, what homes sell for, council tax, the nearest schools and stations, and crime around it.

SW1Y 4AASW1Y 4ADSW1Y 4AESW1Y 4AHSW1Y 4AJSW1Y 4ANSW1Y 4ARSW1Y 4AUSW1Y 4BESW1Y 4BNSW1Y 4BPSW1Y 4DGSW1Y 4DLSW1Y 4DNSW1Y 4DPSW1Y 4EASW1Y 4EESW1Y 4EHSW1Y 4ELSW1Y 4ENSW1Y 4EXSW1Y 4HASW1Y 4HESW1Y 4HGSW1Y 4HHSW1Y 4HTSW1Y 4HXSW1Y 4JESW1Y 4JHSW1Y 4JRSW1Y 4JSSW1Y 4JUSW1Y 4JYSW1Y 4JZSW1Y 4LBSW1Y 4LESW1Y 4LGSW1Y 4LHSW1Y 4LRSW1Y 4NBSW1Y 4NESW1Y 4NQSW1Y 4NWSW1Y 4PDSW1Y 4PESW1Y 4PHSW1Y 4QESW1Y 4QFSW1Y 4QLSW1Y 4QNSW1Y 4QQSW1Y 4QUSW1Y 4QXSW1Y 4RFSW1Y 4RGSW1Y 4RJSW1Y 4RLSW1Y 4RPSW1Y 4RWSW1Y 4SPSW1Y 4SQSW1Y 4SWSW1Y 4TESW1Y 4TPSW1Y 4TQSW1Y 4UFSW1Y 4UHSW1Y 4UJSW1Y 4URSW1Y 4UYSW1Y 4XA

Source: ONS Postcode Directory, August 2026, loaded 20 October 2026. Postcodes that have ended are not listed.

What council am I in? The council, borough or local authority for a postcode, and the county council where there is one. What ward am I in? The ward for a postcode, with its council, constituency and parish.

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Where the facts on this page come from

Contains public sector information licensed under the Open Government Licence v3.0.

Licence: Open Government Licence v3.0.

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