SL1 3 postcode sector in the SL1 district

SL1 3 is a sector of the SL1 district: every postcode that starts SL1 3. It has 264 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 3 sector, by flood risk

Map of every postcode in the SL1 3 sector, by flood risk Of the 264 postcodes in the SL1 3 sector that ONS places, 47 have a home or business at high risk, 4 are at medium risk at worst, 6 are at low risk at worst and 207 are not on the Environment Agency's at-risk list. 3 groups of postcodes at high or medium risk are outlined: 25 postcodes at high or medium risk; 14 postcodes at high or medium risk; 6 postcodes at high or medium risk. One postcode lies beyond the edge and is listed under the map. Places named: Slough. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A355 SL1 3AA: not on the flood risk listSL1 3AB: not on the flood risk listSL1 3AD: not on the flood risk listSL1 3AE: not on the flood risk listSL1 3AF: not on the flood risk listSL1 3AG: not on the flood risk listSL1 3AL: not on the flood risk listSL1 3AQ: not on the flood risk listSL1 3AS: not on the flood risk listSL1 3AT: not on the flood risk listSL1 3AU: not on the flood risk listSL1 3AZ: not on the flood risk listSL1 3BD: not on the flood risk listSL1 3BE: not on the flood risk listSL1 3BH: not on the flood risk listSL1 3BJ: not on the flood risk listSL1 3BL: not on the flood risk listSL1 3BN: not on the flood risk listSL1 3BP: not on the flood risk listSL1 3BW: not on the flood risk listSL1 3BX: not on the flood risk listSL1 3BY: not on the flood risk listSL1 3BZ: not on the flood risk listSL1 3DF: not on the flood risk listSL1 3DG: not on the flood risk listSL1 3DJ: not on the flood risk listSL1 3DL: not on the flood risk listSL1 3DN: not on the flood risk listSL1 3DP: not on the flood risk listSL1 3DQ: not on the flood risk listSL1 3DR: not on the flood risk listSL1 3DT: not on the flood risk listSL1 3DW: not on the flood risk listSL1 3DY: not on the flood risk listSL1 3EA: not on the flood risk listSL1 3EB: not on the flood risk listSL1 3ED: not on the flood risk listSL1 3EE: not on the flood risk listSL1 3EF: not on the flood risk listSL1 3EG: not on the flood risk listSL1 3EQ: not on the flood risk listSL1 3ET: not on the flood risk listSL1 3EU: not on the flood risk listSL1 3EW: not on the flood risk listSL1 3EZ: not on the flood risk listSL1 3FN: not on the flood risk listSL1 3FQ: not on the flood risk listSL1 3FT: not on the flood risk listSL1 3FU: not on the flood risk listSL1 3FW: not on the flood risk listSL1 3FX: not on the flood risk listSL1 3FY: not on the flood risk listSL1 3FZ: not on the flood risk listSL1 3GA: not on the flood risk listSL1 3GD: not on the flood risk listSL1 3GE: not on the flood risk listSL1 3GF: not on the flood risk listSL1 3GG: not on the flood risk listSL1 3GH: not on the flood risk listSL1 3GJ: not on the flood risk listSL1 3GL: not on the flood risk listSL1 3GN: not on the flood risk listSL1 3GP: not on the flood risk listSL1 3GQ: not on the flood risk listSL1 3GR: not on the flood risk listSL1 3GS: not on the flood risk listSL1 3GU: not on the flood risk listSL1 3GW: not on the flood risk listSL1 3GY: not on the flood risk listSL1 3HF: not on the flood risk listSL1 3HG: not on the flood risk listSL1 3HH: not on the flood risk listSL1 3HJ: not on the flood risk listSL1 3HP: not on the flood risk listSL1 3HQ: not on the flood risk listSL1 3HR: not on the flood risk listSL1 3HW: not on the flood risk listSL1 3HX: not on the flood risk listSL1 3HZ: not on the flood risk listSL1 3JA: not on the flood risk listSL1 3JB: not on the flood risk listSL1 3JD: not on the flood risk listSL1 3JW: not on the flood risk listSL1 3LN: not on the flood risk listSL1 3LS: not on the flood risk listSL1 3LT: not on the flood risk listSL1 3LU: not on the flood risk listSL1 3LW: not on the flood risk listSL1 3LX: not on the flood risk listSL1 3LY: not on the flood risk listSL1 3NB: not on the flood risk listSL1 3ND: not on the flood risk listSL1 3NE: not on the flood risk listSL1 3NF: not on the flood risk listSL1 3NL: not on the flood risk listSL1 3NT: not on the flood risk listSL1 3NU: not on the flood risk listSL1 3NX: not on the flood risk listSL1 3NY: not on the flood risk listSL1 3NZ: not on the flood risk listSL1 3PA: not on the flood risk listSL1 3PD: not on the flood risk listSL1 3PE: not on the flood risk listSL1 3PF: not on the flood risk listSL1 3PG: not on the flood risk listSL1 3PH: not on the flood risk listSL1 3PL: not on the flood risk listSL1 3PP: not on the flood risk listSL1 3PQ: not on the flood risk listSL1 3PR: not on the flood risk listSL1 3PS: not on the flood risk listSL1 3PT: not on the flood risk listSL1 3PU: not on the flood risk listSL1 3PX: not on the flood risk listSL1 3QA: not on the flood risk listSL1 3QB: not on the flood risk listSL1 3QD: not on the flood risk listSL1 3QE: not on the flood risk listSL1 3QG: not on the flood risk listSL1 3QH: not on the flood risk listSL1 3QL: not on the flood risk listSL1 3QN: not on the flood risk listSL1 3QP: not on the flood risk listSL1 3QQ: not on the flood risk listSL1 3QR: not on the flood risk listSL1 3QT: not on the flood risk listSL1 3QU: not on the flood risk listSL1 3QW: not on the flood risk listSL1 3QX: not on the flood risk listSL1 3QY: not on the flood risk listSL1 3QZ: not on the flood risk listSL1 3RA: not on the flood risk listSL1 3RB: not on the flood risk listSL1 3RD: not on the flood risk listSL1 3RE: not on the flood risk listSL1 3RG: not on the flood risk listSL1 3RH: not on the flood risk listSL1 3RJ: not on the flood risk listSL1 3RL: not on the flood risk listSL1 3RN: not on the flood risk listSL1 3RP: not on the flood risk listSL1 3RR: not on the flood risk listSL1 3RS: not on the flood risk listSL1 3RW: not on the flood risk listSL1 3RX: not on the flood risk listSL1 3SA: not on the flood risk listSL1 3SE: not on the flood risk listSL1 3SF: not on the flood risk listSL1 3SG: not on the flood risk listSL1 3SH: not on the flood risk listSL1 3SJ: not on the flood risk listSL1 3SL: not on the flood risk listSL1 3SN: not on the flood risk listSL1 3SP: not on the flood risk listSL1 3SQ: not on the flood risk listSL1 3SS: not on the flood risk listSL1 3ST: not on the flood risk listSL1 3SU: not on the flood risk listSL1 3SW: not on the flood risk listSL1 3SX: not on the flood risk listSL1 3SY: not on the flood risk listSL1 3TA: not on the flood risk listSL1 3TD: not on the flood risk listSL1 3TE: not on the flood risk listSL1 3TF: not on the flood risk listSL1 3TG: not on the flood risk listSL1 3TH: not on the flood risk listSL1 3TJ: not on the flood risk listSL1 3TN: not on the flood risk listSL1 3TR: not on the flood risk listSL1 3TS: not on the flood risk listSL1 3TT: not on the flood risk listSL1 3TU: not on the flood risk listSL1 3TW: not on the flood risk listSL1 3TX: not on the flood risk listSL1 3UA: not on the flood risk listSL1 3UF: not on the flood risk listSL1 3UG: not on the flood risk listSL1 3UH: not on the flood risk listSL1 3UQ: not on the flood risk listSL1 3UR: not on the flood risk listSL1 3UT: not on the flood risk listSL1 3UU: not on the flood risk listSL1 3UW: not on the flood risk listSL1 3UX: not on the flood risk listSL1 3WE: not on the flood risk listSL1 3XD: not on the flood risk listSL1 3XF: not on the flood risk listSL1 3XG: not on the flood risk listSL1 3XH: not on the flood risk listSL1 3XJ: not on the flood risk listSL1 3XL: not on the flood risk listSL1 3XN: not on the flood risk listSL1 3XP: not on the flood risk listSL1 3XQ: not on the flood risk listSL1 3XS: not on the flood risk listSL1 3XT: not on the flood risk listSL1 3XW: not on the flood risk listSL1 3XX: not on the flood risk listSL1 3XY: not on the flood risk listSL1 3YA: not on the flood risk listSL1 3YD: not on the flood risk listSL1 3BQ: low flood risk at worstSL1 3BU: low flood risk at worstSL1 3EL: low flood risk at worstSL1 3EX: low flood risk at worstSL1 3JL: low flood risk at worstSL1 3LJ: low flood risk at worstSL1 3BG: medium flood risk at worstSL1 3HS: medium flood risk at worstSL1 3JU: medium flood risk at worstSL1 3SR: medium flood risk at worstSL1 3AH: high flood riskSL1 3AN: high flood riskSL1 3AW: high flood riskSL1 3AX: high flood riskSL1 3AY: high flood riskSL1 3EH: high flood riskSL1 3EJ: high flood riskSL1 3EN: high flood riskSL1 3ER: high flood riskSL1 3ES: high flood riskSL1 3EY: high flood riskSL1 3HD: high flood riskSL1 3HE: high flood riskSL1 3HL: high flood riskSL1 3HN: high flood riskSL1 3HT: high flood riskSL1 3HU: high flood riskSL1 3JE: high flood riskSL1 3JF: high flood riskSL1 3JH: high flood riskSL1 3JJ: high flood riskSL1 3JN: high flood riskSL1 3JP: high flood riskSL1 3JQ: high flood riskSL1 3JR: high flood riskSL1 3JS: high flood riskSL1 3JT: high flood riskSL1 3JX: high flood riskSL1 3JY: high flood riskSL1 3JZ: high flood riskSL1 3LA: high flood riskSL1 3LB: high flood riskSL1 3LF: high flood riskSL1 3LG: high flood riskSL1 3LH: high flood riskSL1 3LL: high flood riskSL1 3LQ: high flood riskSL1 3NA: high flood riskSL1 3NG: high flood riskSL1 3NH: high flood riskSL1 3NJ: high flood riskSL1 3NQ: high flood riskSL1 3PB: high flood riskSL1 3PJ: high flood riskSL1 3PY: high flood riskSL1 3XU: high flood riskSL1 3XZ: high flood risk Slough 25 postcodes at high or medium risk, outlined: this goes to SL1 3JY, the one with most homes and businesses at high risk25 postcodes at high or medium risk14 postcodes at high or medium risk, outlined: this goes to SL1 3LF, the one with most homes and businesses at high risk14 postcodes at high or medium risk6 postcodes at high or medium risk, outlined: this goes to SL1 3AN, the one with most homes and businesses at high risk6 postcodes at high or medium risk Map of every postcode in the SL1 3 sector, by flood risk Of the 264 postcodes in the SL1 3 sector that ONS places, 47 have a home or business at high risk, 4 are at medium risk at worst, 6 are at low risk at worst and 207 are not on the Environment Agency's at-risk list. 3 groups of postcodes at high or medium risk are outlined: 25 postcodes at high or medium risk; 14 postcodes at high or medium risk; 6 postcodes at high or medium risk. One postcode lies beyond the edge and is listed under the map. Places named: Slough. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Slough
  • A home or business at high risk: 47
  • At medium risk at worst: 4
  • At low risk at worst: 6
  • At very low risk only: 0
  • Not on the at-risk list: 207
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 264 postcodes in the SL1 3 sector that ONS places, 47 have a home or business at high risk, 4 are at medium risk at worst, 6 are at low risk at worst and 207 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 150 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

47 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.

SL1 3LF42 at high riskSL1 3JE22 at high riskSL1 3EJ21 at high riskSL1 3JY17 at high riskSL1 3JH16 at high riskSL1 3EH14 at high riskSL1 3ER14 at high riskSL1 3JZ14 at high riskSL1 3LG14 at high riskSL1 3LQ14 at high riskSL1 3NH13 at high riskSL1 3EY12 at high risk

Further out, not drawn

This postcode lies well apart from the rest, so the map is drawn without it to show the rest closer; it is in every count.

SL1 3YY

Where the postcodes at high or medium risk lie together

  • 25 postcodes at high or medium risk, outlined on the map. SL1 3JY, is the one with most homes and businesses at high risk.
  • 14 postcodes at high or medium risk, outlined on the map. SL1 3LF, is the one with most homes and businesses at high risk.
  • 6 postcodes at high or medium risk, outlined on the map. SL1 3AN, is the one with most homes and businesses at high risk.

What do homes sell for in SL1 3?

Homes in SL1 3 sold for a typical £369,000 in the 12 months to August 2026, across 58 sales, down 7.7% on the 12 months before, HM Land Registry's figures show.

£369,000 typical price, the 12 months to August 2026
£400,000 12 months to August 2025
▼ down 7.7% on the 12 months before
  • Detached £575,000 5 sales
  • Semi-detached £450,000 18 sales
  • Terraced £390,000 15 sales
  • Flat or maisonette £229,250 20 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 SL1 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 SL1 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.

SL1 3AASL1 3ABSL1 3ADSL1 3AESL1 3AFSL1 3AGSL1 3AHSL1 3ALSL1 3ANSL1 3AQSL1 3ASSL1 3ATSL1 3AUSL1 3AWSL1 3AXSL1 3AYSL1 3AZSL1 3BDSL1 3BESL1 3BGSL1 3BHSL1 3BJSL1 3BLSL1 3BNSL1 3BPSL1 3BQSL1 3BUSL1 3BWSL1 3BXSL1 3BYSL1 3BZSL1 3DFSL1 3DGSL1 3DJSL1 3DLSL1 3DNSL1 3DPSL1 3DQSL1 3DRSL1 3DTSL1 3DWSL1 3DYSL1 3EASL1 3EBSL1 3EDSL1 3EESL1 3EFSL1 3EGSL1 3EHSL1 3EJSL1 3ELSL1 3ENSL1 3EQSL1 3ERSL1 3ESSL1 3ETSL1 3EUSL1 3EWSL1 3EXSL1 3EYSL1 3EZSL1 3FNSL1 3FQSL1 3FTSL1 3FUSL1 3FWSL1 3FXSL1 3FYSL1 3FZSL1 3GASL1 3GDSL1 3GESL1 3GFSL1 3GGSL1 3GHSL1 3GJSL1 3GLSL1 3GNSL1 3GPSL1 3GQSL1 3GRSL1 3GSSL1 3GUSL1 3GWSL1 3GXSL1 3GYSL1 3GZSL1 3HDSL1 3HESL1 3HFSL1 3HGSL1 3HHSL1 3HJSL1 3HLSL1 3HNSL1 3HPSL1 3HQSL1 3HRSL1 3HSSL1 3HTSL1 3HUSL1 3HWSL1 3HXSL1 3HYSL1 3HZSL1 3JASL1 3JBSL1 3JDSL1 3JESL1 3JFSL1 3JHSL1 3JJSL1 3JLSL1 3JNSL1 3JPSL1 3JQSL1 3JRSL1 3JSSL1 3JTSL1 3JUSL1 3JWSL1 3JXSL1 3JYSL1 3JZSL1 3LASL1 3LBSL1 3LFSL1 3LGSL1 3LHSL1 3LJSL1 3LLSL1 3LNSL1 3LQSL1 3LSSL1 3LTSL1 3LUSL1 3LWSL1 3LXSL1 3LYSL1 3NASL1 3NBSL1 3NDSL1 3NESL1 3NFSL1 3NGSL1 3NHSL1 3NJSL1 3NLSL1 3NQSL1 3NTSL1 3NUSL1 3NXSL1 3NYSL1 3NZSL1 3PASL1 3PBSL1 3PDSL1 3PESL1 3PFSL1 3PGSL1 3PHSL1 3PJSL1 3PLSL1 3PPSL1 3PQSL1 3PRSL1 3PSSL1 3PTSL1 3PUSL1 3PXSL1 3PYSL1 3QASL1 3QBSL1 3QDSL1 3QESL1 3QGSL1 3QHSL1 3QLSL1 3QNSL1 3QPSL1 3QQSL1 3QRSL1 3QTSL1 3QUSL1 3QWSL1 3QXSL1 3QYSL1 3QZSL1 3RASL1 3RBSL1 3RDSL1 3RESL1 3RGSL1 3RHSL1 3RJSL1 3RLSL1 3RNSL1 3RPSL1 3RRSL1 3RSSL1 3RWSL1 3RXSL1 3SASL1 3SESL1 3SFSL1 3SGSL1 3SHSL1 3SJSL1 3SLSL1 3SNSL1 3SPSL1 3SQSL1 3SRSL1 3SSSL1 3STSL1 3SUSL1 3SWSL1 3SXSL1 3SYSL1 3TASL1 3TDSL1 3TESL1 3TFSL1 3TGSL1 3THSL1 3TJSL1 3TNSL1 3TRSL1 3TSSL1 3TTSL1 3TUSL1 3TWSL1 3TXSL1 3UASL1 3UFSL1 3UGSL1 3UHSL1 3UQSL1 3URSL1 3UTSL1 3UUSL1 3UWSL1 3UXSL1 3WESL1 3XDSL1 3XESL1 3XFSL1 3XGSL1 3XHSL1 3XJSL1 3XLSL1 3XNSL1 3XPSL1 3XQSL1 3XSSL1 3XTSL1 3XUSL1 3XWSL1 3XXSL1 3XYSL1 3XZSL1 3YASL1 3YDSL1 3YY

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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