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 gigabit broadband

Map of every postcode in the SL1 4 sector, by gigabit broadband Of the 98 postcodes in the SL1 4 sector that ONS places, 4 have no home or business that can get gigabit, 19 have some that can, 64 can all get it and 11 have no Ofcom figure. Places named: Slough. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. SL1 4ET: no Ofcom figureSL1 4FN: no Ofcom figureSL1 4HA: no Ofcom figureSL1 4HF: no Ofcom figureSL1 4LG: no Ofcom figureSL1 4XQ: no Ofcom figureSL1 4AG: gigabit for allSL1 4AN: gigabit for allSL1 4AQ: gigabit for allSL1 4AX: gigabit for allSL1 4AY: gigabit for allSL1 4BD: gigabit for allSL1 4BE: gigabit for allSL1 4BG: gigabit for allSL1 4DX: gigabit for allSL1 4ED: gigabit for allSL1 4EH: gigabit for allSL1 4EL: gigabit for allSL1 4ES: gigabit for allSL1 4HB: gigabit for allSL1 4HE: gigabit for allSL1 4HG: gigabit for allSL1 4HL: gigabit for allSL1 4HR: gigabit for allSL1 4JA: gigabit for allSL1 4JB: gigabit for allSL1 4JG: gigabit for allSL1 4JU: gigabit for allSL1 4JW: gigabit for allSL1 4LA: gigabit for allSL1 4LH: gigabit for allSL1 4LN: gigabit for allSL1 4LU: gigabit for allSL1 4LZ: gigabit for allSL1 4NB: gigabit for allSL1 4NH: gigabit for allSL1 4NJ: gigabit for allSL1 4NL: gigabit for allSL1 4NN: gigabit for allSL1 4PG: gigabit for allSL1 4PJ: gigabit for allSL1 4PL: gigabit for allSL1 4PN: gigabit for allSL1 4PY: gigabit for allSL1 4QT: gigabit for allSL1 4QZ: gigabit for allSL1 4RF: gigabit for allSL1 4SH: gigabit for allSL1 4SS: gigabit for allSL1 4TQ: gigabit for allSL1 4TT: gigabit for allSL1 4TU: gigabit for allSL1 4UE: gigabit for allSL1 4UF: gigabit for allSL1 4UN: gigabit for allSL1 4UT: gigabit for allSL1 4WS: gigabit for allSL1 4XA: gigabit for allSL1 4XB: gigabit for allSL1 4XL: gigabit for allSL1 4XN: gigabit for allSL1 4XT: gigabit for allSL1 4XU: gigabit for allSL1 4XX: gigabit for allSL1 4XZ: gigabit for allSL1 4YA: gigabit for allSL1 4DG: gigabit for allSL1 4AA: some gigabitSL1 4EP: some gigabitSL1 4LP: some gigabitSL1 4LR: some gigabitSL1 4PF: some gigabitSL1 4PH: some gigabitSL1 4QA: some gigabitSL1 4QU: some gigabitSL1 4RA: some gigabitSL1 4RD: some gigabitSL1 4RY: some gigabitSL1 4SP: some gigabitSL1 4ST: some gigabitSL1 4SZ: some gigabitSL1 4TJ: some gigabitSL1 4TN: some gigabitSL1 4XE: some gigabitSL1 4XP: some gigabitSL1 4XS: some gigabitSL1 4DE: no gigabitSL1 4EQ: no gigabitSL1 4EU: no gigabitSL1 4HY: no gigabit Slough Map of every postcode in the SL1 4 sector, by gigabit broadband Of the 98 postcodes in the SL1 4 sector that ONS places, 4 have no home or business that can get gigabit, 19 have some that can, 64 can all get it and 11 have no Ofcom figure. Places named: Slough. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. M4 Slough
  • No home or business can get gigabit: 4
  • Some can get gigabit: 19
  • Every home and business can get gigabit: 64
  • Ofcom gives no figure: 11

Of the 98 postcodes in the SL1 4 sector that ONS places, 4 have no home or business that can get gigabit, 19 have some that can, 64 can all get it and 11 have no Ofcom figure.

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.

Sources: ONS Postcode Directory, August 2026, loaded 20 October 2026; Ofcom Connected Nations, Connected Nations, Spring 2026; roads, rivers and built-up areas: Ordnance Survey open maps. 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.

Postcodes without gigabit

SL1 4DESL1 4EQSL1 4EUSL1 4HY

What do homes sell for in SL1 4?

HM Land Registry records one sale of homes in SL1 4 in the 12 months to September 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 October 2026.

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: ONS Postcode Directory, August 2026, loaded 20 October 2026. Postcodes that have ended are not listed.

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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Where the facts on this page come from

Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0.

Licence: Open Government Licence v3.0.

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