UB9 4 postcode sector in the UB9 district

UB9 4 is a sector of the UB9 district: every postcode that starts UB9 4. It has 76 postcodes in use, one of them a large-user postcode. 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 UB9 4 sector, by flood risk

Map of every postcode in the UB9 4 sector, by flood risk Of the 76 postcodes in the UB9 4 sector that ONS places, 4 have a home or business at high risk, 13 are at medium risk at worst, 2 are at low risk at worst, 4 are at very low risk only and 53 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 16 postcodes at high or medium risk. Places named: Gerrards Cross & Denham. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A412A40 UB9 4AA: not on the flood risk listUB9 4AD: not on the flood risk listUB9 4AS: not on the flood risk listUB9 4AX: not on the flood risk listUB9 4BA: not on the flood risk listUB9 4BB: not on the flood risk listUB9 4BD: not on the flood risk listUB9 4BF: not on the flood risk listUB9 4BX: not on the flood risk listUB9 4DB: not on the flood risk listUB9 4DE: not on the flood risk listUB9 4DF: not on the flood risk listUB9 4DG: not on the flood risk listUB9 4DP: not on the flood risk listUB9 4DS: not on the flood risk listUB9 4DW: not on the flood risk listUB9 4DZ: not on the flood risk listUB9 4EA: not on the flood risk listUB9 4EB: not on the flood risk listUB9 4ED: not on the flood risk listUB9 4EE: not on the flood risk listUB9 4EF: not on the flood risk listUB9 4EG: not on the flood risk listUB9 4EH: not on the flood risk listUB9 4EJ: not on the flood risk listUB9 4EL: not on the flood risk listUB9 4EP: not on the flood risk listUB9 4EQ: not on the flood risk listUB9 4GY: not on the flood risk listUB9 4HA: not on the flood risk listUB9 4HB: not on the flood risk listUB9 4HD: not on the flood risk listUB9 4HF: not on the flood risk listUB9 4HG: not on the flood risk listUB9 4HH: not on the flood risk listUB9 4HJ: not on the flood risk listUB9 4HL: not on the flood risk listUB9 4HN: not on the flood risk listUB9 4HP: not on the flood risk listUB9 4HQ: not on the flood risk listUB9 4HR: not on the flood risk listUB9 4HS: not on the flood risk listUB9 4HW: not on the flood risk listUB9 4LA: not on the flood risk listUB9 4LB: not on the flood risk listUB9 4LD: not on the flood risk listUB9 4LE: not on the flood risk listUB9 4LF: not on the flood risk listUB9 4LG: not on the flood risk listUB9 4LJ: not on the flood risk listUB9 4LQ: not on the flood risk listUB9 4NA: not on the flood risk listUB9 4BE: very low flood risk onlyUB9 4DH: very low flood risk onlyUB9 4DN: very low flood risk onlyUB9 4DY: very low flood risk onlyUB9 4AT: low flood risk at worstUB9 4BT: low flood risk at worstUB9 4AG: medium flood risk at worstUB9 4AH: medium flood risk at worstUB9 4AJ: medium flood risk at worstUB9 4AL: medium flood risk at worstUB9 4AN: medium flood risk at worstUB9 4AP: medium flood risk at worstUB9 4AQ: medium flood risk at worstUB9 4AR: medium flood risk at worstUB9 4AU: medium flood risk at worstUB9 4AW: medium flood risk at worstUB9 4AY: medium flood risk at worstUB9 4AZ: medium flood risk at worstUB9 4DA: medium flood risk at worstUB9 4AF: high flood riskUB9 4BS: high flood riskUB9 4DQ: high flood riskUB9 4HE: high flood risk Gerrards Cross & Denham 16 postcodes at high or medium risk, outlined: this goes to UB9 4DQ, the one with most homes and businesses at high risk16 postcodes at high or medium risk Map of every postcode in the UB9 4 sector, by flood risk Of the 76 postcodes in the UB9 4 sector that ONS places, 4 have a home or business at high risk, 13 are at medium risk at worst, 2 are at low risk at worst, 4 are at very low risk only and 53 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 16 postcodes at high or medium risk. Places named: Gerrards Cross & Denham. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A40M25A412 Gerrards Cross & Denham
  • A home or business at high risk: 4
  • At medium risk at worst: 13
  • At low risk at worst: 2
  • At very low risk only: 4
  • Not on the at-risk list: 53
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 76 postcodes in the UB9 4 sector that ONS places, 4 have a home or business at high risk, 13 are at medium risk at worst, 2 are at low risk at worst, 4 are at very low risk only and 53 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. A dashed outline shows where 5 or more lie within 210 metres of each other. It is not a boundary, and 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

The postcodes at high risk

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

UB9 4DQ14 at high riskUB9 4AF3 at high riskUB9 4BS2 at high riskUB9 4HE1 at high risk

Where the postcodes at high or medium risk lie together

  • 16 postcodes at high or medium risk, outlined on the map. UB9 4DQ, is the one with most homes and businesses at high risk.

What do homes sell for in UB9 4?

Homes in UB9 4 sold for a typical £475,000 in the 12 months to August 2026, across 23 sales, down 16.5% on the 12 months before, HM Land Registry's figures show.

£475,000 typical price, the 12 months to August 2026
£569,000 12 months to August 2025
▼ down 16.5% on the 12 months before
  • Detached 2 sales, too few to price
  • Semi-detached £528,000 8 sales
  • Terraced £450,000 6 sales
  • Flat or maisonette £323,000 7 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 UB9 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 UB9 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.

UB9 4AAUB9 4ABUB9 4ADUB9 4AFUB9 4AGUB9 4AHUB9 4AJUB9 4ALUB9 4ANUB9 4APUB9 4AQUB9 4ARUB9 4ASUB9 4ATUB9 4AUUB9 4AWUB9 4AXUB9 4AYUB9 4AZUB9 4BAUB9 4BBUB9 4BDUB9 4BEUB9 4BFUB9 4BSUB9 4BTUB9 4BXUB9 4DAUB9 4DBUB9 4DEUB9 4DFUB9 4DGUB9 4DHUB9 4DNUB9 4DPUB9 4DQUB9 4DSUB9 4DWUB9 4DYUB9 4DZUB9 4EAUB9 4EBUB9 4EDUB9 4EEUB9 4EFUB9 4EGUB9 4EHUB9 4EJUB9 4ELUB9 4EPUB9 4EQUB9 4GYUB9 4HAUB9 4HBUB9 4HDUB9 4HEUB9 4HFUB9 4HGUB9 4HHUB9 4HJUB9 4HLUB9 4HNUB9 4HPUB9 4HQUB9 4HRUB9 4HSUB9 4HWUB9 4LAUB9 4LBUB9 4LDUB9 4LEUB9 4LFUB9 4LGUB9 4LJUB9 4LQUB9 4NA

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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