SL3 9 postcode sector in the SL3 district

SL3 9 is a sector of the SL3 district: every postcode that starts SL3 9. It has 171 postcodes in use, 2 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 SL3 9 sector, by flood risk

Map of every postcode in the SL3 9 sector, by flood risk Of the 171 postcodes in the SL3 9 sector that ONS places, 86 have a home or business at high risk, 32 are at medium risk at worst, 22 are at low risk at worst, 12 are at very low risk only and 19 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 84 postcodes at high or medium risk; 14 postcodes at high or medium risk. Places named: Datchet. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. SL3 9BU: not on the flood risk listSL3 9GL: not on the flood risk listSL3 9JY: not on the flood risk listSL3 9NB: not on the flood risk listSL3 9NP: not on the flood risk listSL3 9NR: not on the flood risk listSL3 9NS: not on the flood risk listSL3 9NX: not on the flood risk listSL3 9NY: not on the flood risk listSL3 9PF: not on the flood risk listSL3 9PL: not on the flood risk listSL3 9PN: not on the flood risk listSL3 9PS: not on the flood risk listSL3 9PU: not on the flood risk listSL3 9QB: not on the flood risk listSL3 9QR: not on the flood risk listSL3 9ZH: not on the flood risk listSL3 9AB: very low flood risk onlySL3 9AD: very low flood risk onlySL3 9JF: very low flood risk onlySL3 9JS: very low flood risk onlySL3 9JT: very low flood risk onlySL3 9JW: very low flood risk onlySL3 9NU: very low flood risk onlySL3 9PD: very low flood risk onlySL3 9PH: very low flood risk onlySL3 9PP: very low flood risk onlySL3 9PY: very low flood risk onlySL3 9QD: very low flood risk onlySL3 9AF: low flood risk at worstSL3 9AZ: low flood risk at worstSL3 9BT: low flood risk at worstSL3 9DA: low flood risk at worstSL3 9EE: low flood risk at worstSL3 9FA: low flood risk at worstSL3 9FB: low flood risk at worstSL3 9JP: low flood risk at worstSL3 9JR: low flood risk at worstSL3 9JZ: low flood risk at worstSL3 9LA: low flood risk at worstSL3 9LQ: low flood risk at worstSL3 9NE: low flood risk at worstSL3 9NF: low flood risk at worstSL3 9NG: low flood risk at worstSL3 9NH: low flood risk at worstSL3 9NJ: low flood risk at worstSL3 9NQ: low flood risk at worstSL3 9PA: low flood risk at worstSL3 9PB: low flood risk at worstSL3 9PT: low flood risk at worstSL3 9PW: low flood risk at worstSL3 9AA: medium flood risk at worstSL3 9AW: medium flood risk at worstSL3 9BB: medium flood risk at worstSL3 9BG: medium flood risk at worstSL3 9BN: medium flood risk at worstSL3 9BQ: medium flood risk at worstSL3 9BR: medium flood risk at worstSL3 9BW: medium flood risk at worstSL3 9BX: medium flood risk at worstSL3 9DH: medium flood risk at worstSL3 9DQ: medium flood risk at worstSL3 9EB: medium flood risk at worstSL3 9ED: medium flood risk at worstSL3 9EP: medium flood risk at worstSL3 9EQ: medium flood risk at worstSL3 9HB: medium flood risk at worstSL3 9HU: medium flood risk at worstSL3 9JA: medium flood risk at worstSL3 9JB: medium flood risk at worstSL3 9JD: medium flood risk at worstSL3 9JJ: medium flood risk at worstSL3 9JN: medium flood risk at worstSL3 9LH: medium flood risk at worstSL3 9LR: medium flood risk at worstSL3 9PG: medium flood risk at worstSL3 9PQ: medium flood risk at worstSL3 9PX: medium flood risk at worstSL3 9QA: medium flood risk at worstSL3 9RB: medium flood risk at worstSL3 9AE: high flood riskSL3 9AG: high flood riskSL3 9AH: high flood riskSL3 9AL: high flood riskSL3 9AN: high flood riskSL3 9AP: high flood riskSL3 9AQ: high flood riskSL3 9AR: high flood riskSL3 9AS: high flood riskSL3 9AU: high flood riskSL3 9AX: high flood riskSL3 9AY: high flood riskSL3 9BA: high flood riskSL3 9BE: high flood riskSL3 9BJ: high flood riskSL3 9BP: high flood riskSL3 9BS: high flood riskSL3 9BY: high flood riskSL3 9BZ: high flood riskSL3 9DB: high flood riskSL3 9DD: high flood riskSL3 9DE: high flood riskSL3 9DJ: high flood riskSL3 9DL: high flood riskSL3 9DN: high flood riskSL3 9DR: high flood riskSL3 9DS: high flood riskSL3 9DT: high flood riskSL3 9DU: high flood riskSL3 9DW: high flood riskSL3 9DX: high flood riskSL3 9DY: high flood riskSL3 9EA: high flood riskSL3 9EG: high flood riskSL3 9EH: high flood riskSL3 9EJ: high flood riskSL3 9EN: high flood riskSL3 9ER: high flood riskSL3 9EU: high flood riskSL3 9EW: high flood riskSL3 9EX: high flood riskSL3 9EY: high flood riskSL3 9EZ: high flood riskSL3 9HA: high flood riskSL3 9HD: high flood riskSL3 9HE: high flood riskSL3 9HG: high flood riskSL3 9HH: high flood riskSL3 9HJ: high flood riskSL3 9HL: high flood riskSL3 9HN: high flood riskSL3 9HP: high flood riskSL3 9HQ: high flood riskSL3 9HR: high flood riskSL3 9HS: high flood riskSL3 9HT: high flood riskSL3 9HW: high flood riskSL3 9HX: high flood riskSL3 9HY: high flood riskSL3 9HZ: high flood riskSL3 9JE: high flood riskSL3 9JH: high flood riskSL3 9JL: high flood riskSL3 9JQ: high flood riskSL3 9LB: high flood riskSL3 9LD: high flood riskSL3 9LL: high flood riskSL3 9LS: high flood riskSL3 9LT: high flood riskSL3 9LU: high flood riskSL3 9LX: high flood riskSL3 9LY: high flood riskSL3 9LZ: high flood riskSL3 9NA: high flood riskSL3 9ND: high flood riskSL3 9NT: high flood riskSL3 9PE: high flood riskSL3 9PJ: high flood riskSL3 9PR: high flood riskSL3 9QT: high flood riskSL3 9QU: high flood riskSL3 9QX: high flood riskSL3 9QY: high flood riskSL3 9QZ: high flood riskSL3 9RA: high flood risk Datchet 84 postcodes at high or medium risk, outlined: this goes to SL3 9HS, the one with most homes and businesses at high risk84 postcodes at high or medium risk14 postcodes at high or medium risk, outlined: this goes to SL3 9AL, the one with most homes and businesses at high risk14 postcodes at high or medium risk Map of every postcode in the SL3 9 sector, by flood risk Of the 171 postcodes in the SL3 9 sector that ONS places, 86 have a home or business at high risk, 32 are at medium risk at worst, 22 are at low risk at worst, 12 are at very low risk only and 19 are not on the Environment Agency's at-risk list. 2 groups of postcodes at high or medium risk are outlined: 84 postcodes at high or medium risk; 14 postcodes at high or medium risk. Places named: Datchet. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A4 Datchet
  • A home or business at high risk: 86
  • At medium risk at worst: 32
  • At low risk at worst: 22
  • At very low risk only: 12
  • Not on the at-risk list: 19
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 171 postcodes in the SL3 9 sector that ONS places, 86 have a home or business at high risk, 32 are at medium risk at worst, 22 are at low risk at worst, 12 are at very low risk only and 19 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 160 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.

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

86 postcodes here have a home or business at high risk. These are the 12 with the most homes and businesses at that risk.

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

SL3 9HS39 at high riskSL3 9DD35 at high riskSL3 9QU34 at high riskSL3 9HH32 at high riskSL3 9HZ32 at high riskSL3 9AL31 at high riskSL3 9EX30 at high riskSL3 9EW29 at high riskSL3 9HG28 at high riskSL3 9AQ22 at high riskSL3 9HL22 at high riskSL3 9BY22 at high risk

Where the postcodes at high or medium risk lie together

  • 84 postcodes at high or medium risk, outlined on the map. SL3 9HS, is the one with most homes and businesses at high risk.
  • 14 postcodes at high or medium risk, outlined on the map. SL3 9AL, is the one with most homes and businesses at high risk.

What do homes sell for in SL3 9?

Homes in SL3 9 sold for a typical £480,000 in the 12 months to August 2026, across 44 sales, down 11.5% on the 12 months before, HM Land Registry's figures show.

£480,000 typical price, the 12 months to August 2026
£542,500 12 months to August 2025
▼ down 11.5% on the 12 months before
  • Detached £793,750 10 sales
  • Semi-detached £530,000 11 sales
  • Terraced £415,000 13 sales
  • Flat or maisonette £255,000 10 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 SL3 9. 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 SL3 9

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.

SL3 9AASL3 9ABSL3 9ADSL3 9AESL3 9AFSL3 9AGSL3 9AHSL3 9ALSL3 9ANSL3 9APSL3 9AQSL3 9ARSL3 9ASSL3 9ATSL3 9AUSL3 9AWSL3 9AXSL3 9AYSL3 9AZSL3 9BASL3 9BBSL3 9BESL3 9BGSL3 9BJSL3 9BLSL3 9BNSL3 9BPSL3 9BQSL3 9BRSL3 9BSSL3 9BTSL3 9BUSL3 9BWSL3 9BXSL3 9BYSL3 9BZSL3 9DASL3 9DBSL3 9DDSL3 9DESL3 9DHSL3 9DJSL3 9DLSL3 9DNSL3 9DQSL3 9DRSL3 9DSSL3 9DTSL3 9DUSL3 9DWSL3 9DXSL3 9DYSL3 9EASL3 9EBSL3 9EDSL3 9EESL3 9EGSL3 9EHSL3 9EJSL3 9ELSL3 9ENSL3 9EPSL3 9EQSL3 9ERSL3 9EUSL3 9EWSL3 9EXSL3 9EYSL3 9EZSL3 9FASL3 9FBSL3 9GLSL3 9HASL3 9HBSL3 9HDSL3 9HESL3 9HGSL3 9HHSL3 9HJSL3 9HLSL3 9HNSL3 9HPSL3 9HQSL3 9HRSL3 9HSSL3 9HTSL3 9HUSL3 9HWSL3 9HXSL3 9HYSL3 9HZSL3 9JASL3 9JBSL3 9JDSL3 9JESL3 9JFSL3 9JHSL3 9JJSL3 9JLSL3 9JNSL3 9JPSL3 9JQSL3 9JRSL3 9JSSL3 9JTSL3 9JUSL3 9JWSL3 9JYSL3 9JZSL3 9LASL3 9LBSL3 9LDSL3 9LHSL3 9LJSL3 9LLSL3 9LQSL3 9LRSL3 9LSSL3 9LTSL3 9LUSL3 9LXSL3 9LYSL3 9LZSL3 9NASL3 9NBSL3 9NDSL3 9NESL3 9NFSL3 9NGSL3 9NHSL3 9NJSL3 9NPSL3 9NQSL3 9NRSL3 9NSSL3 9NTSL3 9NUSL3 9NXSL3 9NYSL3 9NZSL3 9PASL3 9PBSL3 9PDSL3 9PESL3 9PFSL3 9PGSL3 9PHSL3 9PJSL3 9PLSL3 9PNSL3 9PPSL3 9PQSL3 9PRSL3 9PSSL3 9PTSL3 9PUSL3 9PWSL3 9PXSL3 9PYSL3 9QASL3 9QBSL3 9QDSL3 9QRSL3 9QTSL3 9QUSL3 9QXSL3 9QYSL3 9QZSL3 9RASL3 9RBSL3 9ZH

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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