M25 3 postcode sector in the M25 district

M25 3 is a sector of the M25 district: every postcode that starts M25 3. It has 110 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 M25 3 sector, by flood risk

Map of every postcode in the M25 3 sector, by flood risk Of the 110 postcodes in the M25 3 sector that ONS places, 110 are not on the Environment Agency's at-risk list. Places named: St. Mary's, Holyrood. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. M60 M25 3AA: not on the flood risk listM25 3AB: not on the flood risk listM25 3AD: not on the flood risk listM25 3AE: not on the flood risk listM25 3AF: not on the flood risk listM25 3AG: not on the flood risk listM25 3AH: not on the flood risk listM25 3AJ: not on the flood risk listM25 3AN: not on the flood risk listM25 3AP: not on the flood risk listM25 3AQ: not on the flood risk listM25 3AR: not on the flood risk listM25 3AS: not on the flood risk listM25 3AT: not on the flood risk listM25 3AU: not on the flood risk listM25 3AW: not on the flood risk listM25 3AX: not on the flood risk listM25 3AY: not on the flood risk listM25 3AZ: not on the flood risk listM25 3BB: not on the flood risk listM25 3BD: not on the flood risk listM25 3BE: not on the flood risk listM25 3BH: not on the flood risk listM25 3BL: not on the flood risk listM25 3BN: not on the flood risk listM25 3BR: not on the flood risk listM25 3BS: not on the flood risk listM25 3BT: not on the flood risk listM25 3BU: not on the flood risk listM25 3BW: not on the flood risk listM25 3BX: not on the flood risk listM25 3BY: not on the flood risk listM25 3BZ: not on the flood risk listM25 3DA: not on the flood risk listM25 3DB: not on the flood risk listM25 3DD: not on the flood risk listM25 3DE: not on the flood risk listM25 3DF: not on the flood risk listM25 3DG: not on the flood risk listM25 3DJ: not on the flood risk listM25 3DL: not on the flood risk listM25 3DN: not on the flood risk listM25 3DP: not on the flood risk listM25 3DQ: not on the flood risk listM25 3DR: not on the flood risk listM25 3DS: not on the flood risk listM25 3DT: not on the flood risk listM25 3DU: not on the flood risk listM25 3DW: not on the flood risk listM25 3DX: not on the flood risk listM25 3DY: not on the flood risk listM25 3DZ: not on the flood risk listM25 3EA: not on the flood risk listM25 3EB: not on the flood risk listM25 3EE: not on the flood risk listM25 3EF: not on the flood risk listM25 3EJ: not on the flood risk listM25 3EL: not on the flood risk listM25 3EN: not on the flood risk listM25 3EP: not on the flood risk listM25 3EQ: not on the flood risk listM25 3ER: not on the flood risk listM25 3ES: not on the flood risk listM25 3ET: not on the flood risk listM25 3EU: not on the flood risk listM25 3EW: not on the flood risk listM25 3FB: not on the flood risk listM25 3FD: not on the flood risk listM25 3FF: not on the flood risk listM25 3FG: not on the flood risk listM25 3FH: not on the flood risk listM25 3FW: not on the flood risk listM25 3HA: not on the flood risk listM25 3HB: not on the flood risk listM25 3HD: not on the flood risk listM25 3HE: not on the flood risk listM25 3HG: not on the flood risk listM25 3HH: not on the flood risk listM25 3HJ: not on the flood risk listM25 3HL: not on the flood risk listM25 3HN: not on the flood risk listM25 3HQ: not on the flood risk listM25 3HR: not on the flood risk listM25 3HS: not on the flood risk listM25 3HT: not on the flood risk listM25 3HU: not on the flood risk listM25 3HW: not on the flood risk listM25 3HX: not on the flood risk listM25 3HY: not on the flood risk listM25 3HZ: not on the flood risk listM25 3JA: not on the flood risk listM25 3JD: not on the flood risk listM25 3JE: not on the flood risk listM25 3JF: not on the flood risk listM25 3JG: not on the flood risk listM25 3JH: not on the flood risk listM25 3JJ: not on the flood risk listM25 3JL: not on the flood risk listM25 3JN: not on the flood risk listM25 3JP: not on the flood risk listM25 3JR: not on the flood risk listM25 3JS: not on the flood risk listM25 3JT: not on the flood risk listM25 3JW: not on the flood risk listM25 3JX: not on the flood risk listM25 3TG: not on the flood risk list St. Mary'sHolyrood Map of every postcode in the M25 3 sector, by flood risk Of the 110 postcodes in the M25 3 sector that ONS places, 110 are not on the Environment Agency's at-risk list. Places named: St. Mary's, Holyrood. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. M60 St. Mary'sHolyrood
  • 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: 110

Of the 110 postcodes in the M25 3 sector that ONS places, 110 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 M25 3?

Homes in M25 3 sold for a typical £309,750 in the 12 months to August 2026, across 46 sales, down 5.3% on the 12 months before, HM Land Registry's figures show.

£309,750 typical price, the 12 months to August 2026
£327,000 12 months to August 2025
▼ down 5.3% on the 12 months before
  • Detached £630,000 5 sales
  • Semi-detached £341,500 17 sales
  • Terraced £291,000 19 sales
  • Flat or maisonette £165,000 5 sales

Each bar is that kind's typical price, against the most expensive kind here.

Standard sales of homes at market value at the postcodes that start M25 3. 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 M25 3

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.

M25 3AAM25 3ABM25 3ADM25 3AEM25 3AFM25 3AGM25 3AHM25 3AJM25 3ANM25 3APM25 3AQM25 3ARM25 3ASM25 3ATM25 3AUM25 3AWM25 3AXM25 3AYM25 3AZM25 3BBM25 3BDM25 3BEM25 3BHM25 3BLM25 3BNM25 3BRM25 3BSM25 3BTM25 3BUM25 3BWM25 3BXM25 3BYM25 3BZM25 3DAM25 3DBM25 3DDM25 3DEM25 3DFM25 3DGM25 3DJM25 3DLM25 3DNM25 3DPM25 3DQM25 3DRM25 3DSM25 3DTM25 3DUM25 3DWM25 3DXM25 3DYM25 3DZM25 3EAM25 3EBM25 3EEM25 3EFM25 3EJM25 3ELM25 3ENM25 3EPM25 3EQM25 3ERM25 3ESM25 3ETM25 3EUM25 3EWM25 3FBM25 3FDM25 3FFM25 3FGM25 3FHM25 3FWM25 3HAM25 3HBM25 3HDM25 3HEM25 3HGM25 3HHM25 3HJM25 3HLM25 3HNM25 3HQM25 3HRM25 3HSM25 3HTM25 3HUM25 3HWM25 3HXM25 3HYM25 3HZM25 3JAM25 3JDM25 3JEM25 3JFM25 3JGM25 3JHM25 3JJM25 3JLM25 3JNM25 3JPM25 3JRM25 3JSM25 3JTM25 3JWM25 3JXM25 3NSM25 3TGM25 3WJM25 3WWM25 3XF

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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