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 flood risk

Map of every postcode in the SW1Y 4 sector, by flood risk Of the 71 postcodes in the SW1Y 4 sector that ONS places, 71 are not on the Environment Agency's at-risk list. 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: not on the flood risk listSW1Y 4AD: not on the flood risk listSW1Y 4AE: not on the flood risk listSW1Y 4AH: not on the flood risk listSW1Y 4AJ: not on the flood risk listSW1Y 4AN: not on the flood risk listSW1Y 4AR: not on the flood risk listSW1Y 4AU: not on the flood risk listSW1Y 4BE: not on the flood risk listSW1Y 4BN: not on the flood risk listSW1Y 4BP: not on the flood risk listSW1Y 4DG: not on the flood risk listSW1Y 4DL: not on the flood risk listSW1Y 4DN: not on the flood risk listSW1Y 4DP: not on the flood risk listSW1Y 4EA: not on the flood risk listSW1Y 4EE: not on the flood risk listSW1Y 4EL: not on the flood risk listSW1Y 4EN: not on the flood risk listSW1Y 4EX: not on the flood risk listSW1Y 4HA: not on the flood risk listSW1Y 4HE: not on the flood risk listSW1Y 4HG: not on the flood risk listSW1Y 4HH: not on the flood risk listSW1Y 4HT: not on the flood risk listSW1Y 4HX: not on the flood risk listSW1Y 4JE: not on the flood risk listSW1Y 4JH: not on the flood risk listSW1Y 4JR: not on the flood risk listSW1Y 4JS: not on the flood risk listSW1Y 4JY: not on the flood risk listSW1Y 4JZ: not on the flood risk listSW1Y 4LB: not on the flood risk listSW1Y 4LE: not on the flood risk listSW1Y 4LG: not on the flood risk listSW1Y 4LH: not on the flood risk listSW1Y 4LR: not on the flood risk listSW1Y 4NB: not on the flood risk listSW1Y 4NQ: not on the flood risk listSW1Y 4NW: not on the flood risk listSW1Y 4PD: not on the flood risk listSW1Y 4PE: not on the flood risk listSW1Y 4PH: not on the flood risk listSW1Y 4QE: not on the flood risk listSW1Y 4QL: not on the flood risk listSW1Y 4QN: not on the flood risk listSW1Y 4QQ: not on the flood risk listSW1Y 4QU: not on the flood risk listSW1Y 4QX: not on the flood risk listSW1Y 4RF: not on the flood risk listSW1Y 4RG: not on the flood risk listSW1Y 4RJ: not on the flood risk listSW1Y 4RL: not on the flood risk listSW1Y 4RP: not on the flood risk listSW1Y 4RW: not on the flood risk listSW1Y 4SP: not on the flood risk listSW1Y 4SQ: not on the flood risk listSW1Y 4TE: not on the flood risk listSW1Y 4UF: not on the flood risk listSW1Y 4UH: not on the flood risk listSW1Y 4UJ: not on the flood risk listSW1Y 4UR: not on the flood risk listSW1Y 4UY: not on the flood risk listSW1Y 4XA: not on the flood risk list St James's Map of every postcode in the SW1Y 4 sector, by flood risk Of the 71 postcodes in the SW1Y 4 sector that ONS places, 71 are not on the Environment Agency's at-risk list. 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
  • A home or business at high risk: 0
  • At medium risk at worst: 0
  • At low risk at worst: 0
  • At very low risk only: 0
  • Not on the at-risk list: 71

Of the 71 postcodes in the SW1Y 4 sector that ONS places, 71 are not on the Environment Agency's at-risk list.

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.

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; flood risk: Environment Agency, published 6 July 2026; roads, rivers and built-up areas: 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. How we use them

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: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. Postcodes that have ended are not listed. See all our data sources

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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