SL1 4 postcode sector in the SL1 district

SL1 4 is a sector of the SL1 district: every postcode that starts SL1 4. It has 98 postcodes in use, 8 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 SL1 4 sector, by flood risk

Map of every postcode in the SL1 4 sector, by flood risk Of the 98 postcodes in the SL1 4 sector that ONS places, 1 have a home or business at high risk, 1 are at very low risk only and 96 are not on the Environment Agency's at-risk list. Places named: Slough. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. SL1 4AA: not on the flood risk listSL1 4AG: not on the flood risk listSL1 4AN: not on the flood risk listSL1 4AQ: not on the flood risk listSL1 4AX: not on the flood risk listSL1 4AY: not on the flood risk listSL1 4BD: not on the flood risk listSL1 4BE: not on the flood risk listSL1 4BG: not on the flood risk listSL1 4BH: not on the flood risk listSL1 4DE: not on the flood risk listSL1 4DX: not on the flood risk listSL1 4ED: not on the flood risk listSL1 4EH: not on the flood risk listSL1 4EL: not on the flood risk listSL1 4EP: not on the flood risk listSL1 4EQ: not on the flood risk listSL1 4ES: not on the flood risk listSL1 4ET: not on the flood risk listSL1 4EU: not on the flood risk listSL1 4FN: not on the flood risk listSL1 4HA: not on the flood risk listSL1 4HB: not on the flood risk listSL1 4HE: not on the flood risk listSL1 4HF: not on the flood risk listSL1 4HG: not on the flood risk listSL1 4HL: not on the flood risk listSL1 4HR: not on the flood risk listSL1 4HY: not on the flood risk listSL1 4JA: not on the flood risk listSL1 4JB: not on the flood risk listSL1 4JG: not on the flood risk listSL1 4JU: not on the flood risk listSL1 4JW: not on the flood risk listSL1 4LA: not on the flood risk listSL1 4LG: not on the flood risk listSL1 4LH: not on the flood risk listSL1 4LN: not on the flood risk listSL1 4LR: not on the flood risk listSL1 4LU: not on the flood risk listSL1 4LZ: not on the flood risk listSL1 4NB: not on the flood risk listSL1 4NH: not on the flood risk listSL1 4NJ: not on the flood risk listSL1 4NL: not on the flood risk listSL1 4PF: not on the flood risk listSL1 4PG: not on the flood risk listSL1 4PH: not on the flood risk listSL1 4PJ: not on the flood risk listSL1 4PL: not on the flood risk listSL1 4PN: not on the flood risk listSL1 4PY: not on the flood risk listSL1 4QA: not on the flood risk listSL1 4QT: not on the flood risk listSL1 4QU: not on the flood risk listSL1 4QZ: not on the flood risk listSL1 4RA: not on the flood risk listSL1 4RD: not on the flood risk listSL1 4RF: not on the flood risk listSL1 4RY: not on the flood risk listSL1 4SH: not on the flood risk listSL1 4SP: not on the flood risk listSL1 4SS: not on the flood risk listSL1 4ST: not on the flood risk listSL1 4SZ: not on the flood risk listSL1 4TJ: not on the flood risk listSL1 4TN: not on the flood risk listSL1 4TQ: not on the flood risk listSL1 4TT: not on the flood risk listSL1 4TU: not on the flood risk listSL1 4UE: not on the flood risk listSL1 4UF: not on the flood risk listSL1 4UN: not on the flood risk listSL1 4UT: not on the flood risk listSL1 4WS: not on the flood risk listSL1 4XA: not on the flood risk listSL1 4XB: not on the flood risk listSL1 4XE: not on the flood risk listSL1 4XL: not on the flood risk listSL1 4XN: not on the flood risk listSL1 4XP: not on the flood risk listSL1 4XQ: not on the flood risk listSL1 4XS: not on the flood risk listSL1 4XT: not on the flood risk listSL1 4XU: not on the flood risk listSL1 4XX: not on the flood risk listSL1 4XZ: not on the flood risk listSL1 4YA: not on the flood risk listSL1 4NN: very low flood risk onlySL1 4LP: high flood risk Slough Map of every postcode in the SL1 4 sector, by flood risk Of the 98 postcodes in the SL1 4 sector that ONS places, 1 have a home or business at high risk, 1 are at very low risk only and 96 are not on the Environment Agency's at-risk list. Places named: Slough. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. M4 Slough
  • A home or business at high risk: 1
  • At medium risk at worst: 0
  • At low risk at worst: 0
  • At very low risk only: 1
  • Not on the at-risk list: 96

Of the 98 postcodes in the SL1 4 sector that ONS places, 1 have a home or business at high risk, 1 are at very low risk only and 96 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.

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.

SL1 4LP1 at high risk

What do homes sell for in SL1 4?

HM Land Registry records one sale of homes in SL1 4 in the 12 months to August 2026: too few to give a typical price.

  • Terraced 1 sale, too few to price

Standard sales of homes at market value at the postcodes that start SL1 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 SL1 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.

SL1 4AASL1 4AGSL1 4ANSL1 4AQSL1 4AXSL1 4AYSL1 4BDSL1 4BESL1 4BFSL1 4BGSL1 4BHSL1 4DESL1 4DGSL1 4DXSL1 4EDSL1 4EHSL1 4ELSL1 4EPSL1 4EQSL1 4ESSL1 4ETSL1 4EUSL1 4FNSL1 4FWSL1 4HASL1 4HBSL1 4HESL1 4HFSL1 4HGSL1 4HLSL1 4HRSL1 4HYSL1 4JASL1 4JBSL1 4JGSL1 4JUSL1 4JWSL1 4LASL1 4LGSL1 4LHSL1 4LNSL1 4LPSL1 4LRSL1 4LUSL1 4LZSL1 4NBSL1 4NHSL1 4NJSL1 4NLSL1 4NNSL1 4PFSL1 4PGSL1 4PHSL1 4PJSL1 4PLSL1 4PNSL1 4PYSL1 4QASL1 4QTSL1 4QUSL1 4QZSL1 4RASL1 4RDSL1 4RFSL1 4RYSL1 4SGSL1 4SHSL1 4SPSL1 4SSSL1 4STSL1 4SZSL1 4TJSL1 4TNSL1 4TQSL1 4TTSL1 4TUSL1 4UESL1 4UFSL1 4UNSL1 4UTSL1 4WASL1 4WESL1 4WSSL1 4XASL1 4XBSL1 4XESL1 4XLSL1 4XNSL1 4XPSL1 4XQSL1 4XSSL1 4XTSL1 4XUSL1 4XXSL1 4XYSL1 4XZSL1 4YASL1 4ZA

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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