SW1A postcode district: City of Westminster and around

SW1A is a postcode district in England, with 145 postcodes in use in 3 sectors. It has postcodes in City of Westminster and Wandsworth. It is split between 2 councils: Westminster (143 postcodes) and Wandsworth (2).

Postcodes in use
145
Sectors
3
Councils
2 councils
Places
2 places

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in SW1A, by flood risk

Map of every postcode in SW1A, by flood risk Of the 145 postcodes in SW1A that ONS places, 2 have a home or business at high risk, 46 are at very low risk only and 97 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. A3212A202A301A302 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 1EG: 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 1HJ: not on the flood risk listSW1A 1JB: not on the flood risk listSW1A 1JD: 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 1LZ: 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 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 2AB: not on the flood risk listSW1A 2BA: not on the flood risk listSW1A 2BB: not on the flood risk listSW1A 2BH: not on the flood risk listSW1A 2BL: not on the flood risk listSW1A 2BQ: not on the flood risk listSW1A 2BT: not on the flood risk listSW1A 2DA: not on the flood risk listSW1A 2DR: not on the flood risk listSW1A 2DX: not on the flood risk listSW1A 2EF: not on the flood risk listSW1A 2EH: not on the flood risk listSW1A 2EJ: not on the flood risk listSW1A 2HQ: not on the flood risk listSW1A 2HU: not on the flood risk listSW1A 2JX: not on the flood risk listSW1A 2NL: not on the flood risk listSW1A 2SH: not on the flood risk listSW1A 2TS: not on the flood risk listSW1A 2WH: not on the flood risk listSW1A 0AA: very low flood risk onlySW1A 1AA: very low flood risk onlySW1A 2AA: very low flood risk onlySW1A 2AD: very low flood risk onlySW1A 2AE: very low flood risk onlySW1A 2AG: very low flood risk onlySW1A 2AH: very low flood risk onlySW1A 2AQ: very low flood risk onlySW1A 2AU: very low flood risk onlySW1A 2AW: very low flood risk onlySW1A 2AX: very low flood risk onlySW1A 2AY: very low flood risk onlySW1A 2BD: very low flood risk onlySW1A 2BE: very low flood risk onlySW1A 2BJ: very low flood risk onlySW1A 2BS: very low flood risk onlySW1A 2BX: very low flood risk onlySW1A 2DD: very low flood risk onlySW1A 2DG: very low flood risk onlySW1A 2EG: very low flood risk onlySW1A 2EP: very low flood risk onlySW1A 2ER: very low flood risk onlySW1A 2EX: very low flood risk onlySW1A 2HB: very low flood risk onlySW1A 2HD: very low flood risk onlySW1A 2HJ: very low flood risk onlySW1A 2HN: very low flood risk onlySW1A 2HP: very low flood risk onlySW1A 2HZ: very low flood risk onlySW1A 2JF: very low flood risk onlySW1A 2JJ: very low flood risk onlySW1A 2JL: very low flood risk onlySW1A 2JN: very low flood risk onlySW1A 2JR: very low flood risk onlySW1A 2LW: very low flood risk onlySW1A 2NE: very low flood risk onlySW1A 2NH: very low flood risk onlySW1A 2NP: very low flood risk onlySW1A 2HR: high flood riskSW1A 2JH: high flood risk St James's Map of every postcode in SW1A, by flood risk Of the 145 postcodes in SW1A that ONS places, 2 have a home or business at high risk, 46 are at very low risk only and 97 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: 2
  • At medium risk at worst: 0
  • At low risk at worst: 0
  • At very low risk only: 46
  • Not on the at-risk list: 97

Of the 145 postcodes in SW1A that ONS places, 2 have a home or business at high risk, 46 are at very low risk only and 97 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.

The middle of its postcodes: latitude 51.5046, longitude -0.1322. Open this area on OpenStreetMap

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

The postcodes at high risk

Beside each: how many of its homes and businesses the Environment Agency puts at that risk.

SW1A 2JH5 at high riskSW1A 2HR1 at high risk

What broadband can you get in SW1A?

Ofcom reports on 125 of the 145 postcodes in SW1A. At 76 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit76 of 125
Postcodes where every home can get superfast76 of 125

Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.

Check one address on Ofcom's checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is SW1A at risk of flooding?

48 of the 145 postcodes in SW1A have a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 6 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 48 of 145 postcodes High: 6Very low: 207

High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.

Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.

Source: Environment Agency, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it

What do homes sell for in SW1A?

HM Land Registry records one sale of homes in SW1A 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. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.

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

Pick a sector, then a postcode. A sector is the district plus the next digit.

SW1A 03 postcodesSW1A 167 postcodesSW1A 275 postcodes
UK postcode format explained

Places in SW1A

Towns and villages with postcodes in SW1A, and how many each has here.

City of Westminster postcodes,142Wandsworth postcodes,2

Who covers SW1A

How many of the district's postcodes in use fall under each council, constituency and police force area.

Councils

What council am I in?

Constituencies

  • Cities of London and Westminster143
  • Battersea2

Police force areas

  • Metropolitan Police145

Next to SW1A

SW1E postcode district All SW districts City of Westminster postcodes

"Next to" is by number: the district after SW1A in the SW area.

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