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, and which are new since 2020

Map of every postcode in the SW1Y 4 sector, by new since 2020 Of the 71 postcodes in the SW1Y 4 sector that ONS places, 1 are new since 2020 and 70 were in use before 2020. Places named: St James's. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A4201A4A400 SW1Y 4AA: before 2020SW1Y 4AD: before 2020SW1Y 4AE: before 2020SW1Y 4AH: before 2020SW1Y 4AJ: before 2020SW1Y 4AN: before 2020SW1Y 4AR: before 2020SW1Y 4AU: before 2020SW1Y 4BE: before 2020SW1Y 4BN: before 2020SW1Y 4BP: before 2020SW1Y 4DG: before 2020SW1Y 4DL: before 2020SW1Y 4DN: before 2020SW1Y 4DP: before 2020SW1Y 4EA: before 2020SW1Y 4EE: before 2020SW1Y 4EL: before 2020SW1Y 4EN: before 2020SW1Y 4EX: before 2020SW1Y 4HA: before 2020SW1Y 4HE: before 2020SW1Y 4HG: before 2020SW1Y 4HH: before 2020SW1Y 4HT: before 2020SW1Y 4HX: before 2020SW1Y 4JE: before 2020SW1Y 4JH: before 2020SW1Y 4JR: before 2020SW1Y 4JS: before 2020SW1Y 4JY: before 2020SW1Y 4JZ: before 2020SW1Y 4LB: before 2020SW1Y 4LE: before 2020SW1Y 4LG: before 2020SW1Y 4LH: before 2020SW1Y 4LR: before 2020SW1Y 4NB: before 2020SW1Y 4NQ: before 2020SW1Y 4NW: before 2020SW1Y 4PD: before 2020SW1Y 4PE: before 2020SW1Y 4PH: before 2020SW1Y 4QE: before 2020SW1Y 4QN: before 2020SW1Y 4QQ: before 2020SW1Y 4QU: before 2020SW1Y 4QX: before 2020SW1Y 4RF: before 2020SW1Y 4RG: before 2020SW1Y 4RJ: before 2020SW1Y 4RL: before 2020SW1Y 4RP: before 2020SW1Y 4RW: before 2020SW1Y 4SP: before 2020SW1Y 4SQ: before 2020SW1Y 4TE: before 2020SW1Y 4UF: before 2020SW1Y 4UH: before 2020SW1Y 4UJ: before 2020SW1Y 4UR: before 2020SW1Y 4UY: before 2020SW1Y 4XA: before 2020SW1Y 4QL: new since 2020 St James's Map of every postcode in the SW1Y 4 sector, by new since 2020 Of the 71 postcodes in the SW1Y 4 sector that ONS places, 1 are new since 2020 and 70 were in use before 2020. 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
  • New since 2020: 1
  • In use before 2020: 70

Of the 71 postcodes in the SW1Y 4 sector that ONS places, 1 are new since 2020 and 70 were in use before 2020.

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. New since 2020 means it came into use in January 2020 or later. 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; 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.

The newest postcode

SW1Y 4QLOctober 2024

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

Licence: Open Government Licence v3.0.

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