SW1A 1 postcode sector in the SW1A district

SW1A 1 is a sector of the SW1A district: every postcode that starts SW1A 1. It has 67 postcodes in use, 20 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 SW1A 1 sector, by flood risk

Map of every postcode in the SW1A 1 sector, by flood risk Of the 67 postcodes in the SW1A 1 sector that ONS places, 1 are at very low risk only and 66 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 500 m. A3212A4A302A3216 SW1A 1AB: not on the flood risk listSW1A 1AG: not on the flood risk listSW1A 1BA: not on the flood risk listSW1A 1BB: not on the flood risk listSW1A 1BD: not on the flood risk listSW1A 1BG: not on the flood risk listSW1A 1BH: not on the flood risk listSW1A 1BJ: not on the flood risk listSW1A 1BL: not on the flood risk listSW1A 1BQ: not on the flood risk listSW1A 1BW: not on the flood risk listSW1A 1DA: not on the flood risk listSW1A 1DD: not on the flood risk listSW1A 1DH: not on the flood risk listSW1A 1DP: not on the flood risk listSW1A 1DR: not on the flood risk listSW1A 1EA: not on the flood risk listSW1A 1EE: not on the flood risk listSW1A 1EF: not on the flood risk listSW1A 1ER: not on the flood risk listSW1A 1ES: not on the flood risk listSW1A 1HA: not on the flood risk listSW1A 1HD: not on the flood risk listSW1A 1JB: not on the flood risk listSW1A 1JD: not on the flood risk listSW1A 1JG: not on the flood risk listSW1A 1JR: not on the flood risk listSW1A 1JT: not on the flood risk listSW1A 1LA: not on the flood risk listSW1A 1LD: not on the flood risk listSW1A 1LE: not on the flood risk listSW1A 1LN: not on the flood risk listSW1A 1LP: not on the flood risk listSW1A 1LR: not on the flood risk listSW1A 1LS: not on the flood risk listSW1A 1LY: not on the flood risk listSW1A 1NE: not on the flood risk listSW1A 1NF: not on the flood risk listSW1A 1NH: not on the flood risk listSW1A 1NJ: not on the flood risk listSW1A 1NN: not on the flood risk listSW1A 1NP: not on the flood risk listSW1A 1NR: not on the flood risk listSW1A 1NS: not on the flood risk listSW1A 1NX: not on the flood risk listSW1A 1NY: not on the flood risk listSW1A 1PH: not on the flood risk listSW1A 1PJ: not on the flood risk listSW1A 1PL: not on the flood risk listSW1A 1RA: not on the flood risk listSW1A 1RB: not on the flood risk listSW1A 1RD: not on the flood risk listSW1A 1RE: not on the flood risk listSW1A 1RN: not on the flood risk listSW1A 1YT: not on the flood risk listSW1A 1AA: very low flood risk only St James's Map of every postcode in the SW1A 1 sector, by flood risk Of the 67 postcodes in the SW1A 1 sector that ONS places, 1 are at very low risk only and 66 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 500 m. A3212 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: 1
  • Not on the at-risk list: 66

Of the 67 postcodes in the SW1A 1 sector that ONS places, 1 are at very low risk only and 66 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

What do homes sell for in SW1A 1?

HM Land Registry records one sale of homes in SW1A 1 in the 12 months to August 2026: too few to give a typical price.

  • Flat or maisonette 1 sale, too few to price

Standard sales of homes at market value at the postcodes that start SW1A 1. A typical price is the median, the middle sale, given from 5 sales or more.

How we work this out: house prices by postcode

Source: HM Land Registry Price Paid Data, files dated 28 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it

Postcodes in SW1A 1

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.

SW1A 1AASW1A 1ABSW1A 1AGSW1A 1AHSW1A 1BASW1A 1BBSW1A 1BDSW1A 1BGSW1A 1BHSW1A 1BJSW1A 1BLSW1A 1BNSW1A 1BQSW1A 1BSSW1A 1BWSW1A 1DASW1A 1DDSW1A 1DHSW1A 1DPSW1A 1DRSW1A 1EASW1A 1EESW1A 1EFSW1A 1EGSW1A 1ERSW1A 1ESSW1A 1HASW1A 1HDSW1A 1HJSW1A 1JBSW1A 1JDSW1A 1JGSW1A 1JRSW1A 1JTSW1A 1LASW1A 1LDSW1A 1LESW1A 1LNSW1A 1LPSW1A 1LRSW1A 1LSSW1A 1LYSW1A 1LZSW1A 1NESW1A 1NFSW1A 1NHSW1A 1NJSW1A 1NNSW1A 1NPSW1A 1NRSW1A 1NSSW1A 1NXSW1A 1NYSW1A 1PHSW1A 1PJSW1A 1PLSW1A 1RASW1A 1RBSW1A 1RDSW1A 1RESW1A 1RGSW1A 1RJSW1A 1RLSW1A 1RNSW1A 1RPSW1A 1YTSW1A 1ZA

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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