W1K 4 postcode sector in the W1K district

W1K 4 is a sector of the W1K district: every postcode that starts W1K 4. It has 94 postcodes in use, 6 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 W1K 4 sector, and which are new since 2020

Map of every postcode in the W1K 4 sector, by new since 2020 Of the 94 postcodes in the W1K 4 sector that ONS places, 4 are new since 2020 and 90 were in use before 2020. Places named: City of Westminster. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A4201 W1K 4AE: before 2020W1K 4AF: before 2020W1K 4AG: before 2020W1K 4AH: before 2020W1K 4AJ: before 2020W1K 4AL: before 2020W1K 4AN: before 2020W1K 4AP: before 2020W1K 4AR: before 2020W1K 4AS: before 2020W1K 4AX: before 2020W1K 4AY: before 2020W1K 4BA: before 2020W1K 4BF: before 2020W1K 4BH: before 2020W1K 4BP: before 2020W1K 4DF: before 2020W1K 4DG: before 2020W1K 4DS: before 2020W1K 4DT: before 2020W1K 4DX: before 2020W1K 4DY: before 2020W1K 4EA: before 2020W1K 4EB: before 2020W1K 4EE: before 2020W1K 4EF: before 2020W1K 4EH: before 2020W1K 4ER: before 2020W1K 4HA: before 2020W1K 4HB: before 2020W1K 4HD: before 2020W1K 4HF: before 2020W1K 4HG: before 2020W1K 4HH: before 2020W1K 4HJ: before 2020W1K 4HL: before 2020W1K 4HP: before 2020W1K 4HQ: before 2020W1K 4HR: before 2020W1K 4HS: before 2020W1K 4HW: before 2020W1K 4HX: before 2020W1K 4JP: before 2020W1K 4JR: before 2020W1K 4JS: before 2020W1K 4JT: before 2020W1K 4JU: before 2020W1K 4LT: before 2020W1K 4LU: before 2020W1K 4LX: before 2020W1K 4NA: before 2020W1K 4NB: before 2020W1K 4PA: before 2020W1K 4PS: before 2020W1K 4PT: before 2020W1K 4PX: before 2020W1K 4PZ: before 2020W1K 4QB: before 2020W1K 4QF: before 2020W1K 4QG: before 2020W1K 4QJ: before 2020W1K 4QL: before 2020W1K 4QN: before 2020W1K 4QP: before 2020W1K 4QQ: before 2020W1K 4QR: before 2020W1K 4QU: before 2020W1K 4QW: before 2020W1K 4QX: before 2020W1K 4AB: new since 2020W1K 4BN: new since 2020W1K 4HY: new since 2020W1K 4NJ: new since 2020 City of Westminster Map of every postcode in the W1K 4 sector, by new since 2020 Of the 94 postcodes in the W1K 4 sector that ONS places, 4 are new since 2020 and 90 were in use before 2020. Places named: City of Westminster. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A40 City of Westminster
  • New since 2020: 4
  • In use before 2020: 90

Of the 94 postcodes in the W1K 4 sector that ONS places, 4 are new since 2020 and 90 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.

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; when each came into use: the same directory; 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 4 newest postcodes

W1K 4NJDecember 2025W1K 4HYOctober 2022W1K 4ABSeptember 2020W1K 4BNApril 2020

What do homes sell for in W1K 4?

HM Land Registry records 3 sales of homes in W1K 4 in the 12 months to August 2026: too few to give a typical price.

  • Flat or maisonette 3 sales, too few to price

Standard sales of homes at market value at the postcodes that start W1K 4. 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 W1K 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.

W1K 4ABW1K 4AEW1K 4AFW1K 4AGW1K 4AHW1K 4AJW1K 4ALW1K 4ANW1K 4APW1K 4ARW1K 4ASW1K 4ATW1K 4AWW1K 4AXW1K 4AYW1K 4AZW1K 4BAW1K 4BBW1K 4BDW1K 4BEW1K 4BFW1K 4BHW1K 4BNW1K 4BPW1K 4DFW1K 4DGW1K 4DSW1K 4DTW1K 4DXW1K 4DYW1K 4DZW1K 4EAW1K 4EBW1K 4EDW1K 4EEW1K 4EFW1K 4EGW1K 4EHW1K 4ERW1K 4HAW1K 4HBW1K 4HDW1K 4HEW1K 4HFW1K 4HGW1K 4HHW1K 4HJW1K 4HLW1K 4HNW1K 4HPW1K 4HQW1K 4HRW1K 4HSW1K 4HUW1K 4HWW1K 4HXW1K 4HYW1K 4JPW1K 4JRW1K 4JSW1K 4JTW1K 4JUW1K 4LRW1K 4LTW1K 4LUW1K 4LXW1K 4LYW1K 4NAW1K 4NBW1K 4NDW1K 4NEW1K 4NFW1K 4NJW1K 4PAW1K 4PSW1K 4PTW1K 4PUW1K 4PXW1K 4PZW1K 4QBW1K 4QFW1K 4QGW1K 4QJW1K 4QLW1K 4QNW1K 4QPW1K 4QQW1K 4QRW1K 4QSW1K 4QUW1K 4QWW1K 4QXW1K 4QYW1K 4QZ

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.

Check a postcode

Something wrong on this page? Report an error and we will check it against the source.