SL4 3 postcode sector in the SL4 district

SL4 3 is a sector of the SL4 district: every postcode that starts SL4 3. It has 238 postcodes in use, 11 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 SL4 3 sector, and which are new since 2020

Map of every postcode in the SL4 3 sector, by new since 2020 Of the 238 postcodes in the SL4 3 sector that ONS places, 5 are new since 2020 and 233 were in use before 2020. Places named: Windsor. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A308A332 SL4 3AA: before 2020SL4 3AE: before 2020SL4 3AG: before 2020SL4 3AH: before 2020SL4 3AJ: before 2020SL4 3AL: before 2020SL4 3AN: before 2020SL4 3AP: before 2020SL4 3AQ: before 2020SL4 3AR: before 2020SL4 3AS: before 2020SL4 3AT: before 2020SL4 3AU: before 2020SL4 3AX: before 2020SL4 3AZ: before 2020SL4 3BA: before 2020SL4 3BB: before 2020SL4 3BD: before 2020SL4 3BE: before 2020SL4 3BG: before 2020SL4 3BH: before 2020SL4 3BJ: before 2020SL4 3BL: before 2020SL4 3BN: before 2020SL4 3BP: before 2020SL4 3BQ: before 2020SL4 3BT: before 2020SL4 3BU: before 2020SL4 3BW: before 2020SL4 3BX: before 2020SL4 3BY: before 2020SL4 3BZ: before 2020SL4 3DA: before 2020SL4 3DB: before 2020SL4 3DD: before 2020SL4 3DE: before 2020SL4 3DF: before 2020SL4 3DG: before 2020SL4 3DH: before 2020SL4 3DJ: before 2020SL4 3DL: before 2020SL4 3DN: before 2020SL4 3DP: before 2020SL4 3DQ: before 2020SL4 3DR: before 2020SL4 3DS: before 2020SL4 3DT: before 2020SL4 3DU: before 2020SL4 3DW: before 2020SL4 3DX: before 2020SL4 3DY: before 2020SL4 3DZ: before 2020SL4 3EA: before 2020SL4 3EB: before 2020SL4 3ED: before 2020SL4 3EE: before 2020SL4 3EG: before 2020SL4 3EH: before 2020SL4 3EL: before 2020SL4 3EN: before 2020SL4 3EP: before 2020SL4 3EQ: before 2020SL4 3ER: before 2020SL4 3ES: before 2020SL4 3ET: before 2020SL4 3EU: before 2020SL4 3EW: before 2020SL4 3EX: before 2020SL4 3EY: before 2020SL4 3EZ: before 2020SL4 3FA: before 2020SL4 3FE: before 2020SL4 3FF: before 2020SL4 3FG: before 2020SL4 3FH: before 2020SL4 3FJ: before 2020SL4 3FL: before 2020SL4 3FP: before 2020SL4 3GZ: before 2020SL4 3HA: before 2020SL4 3HB: before 2020SL4 3HD: before 2020SL4 3HE: before 2020SL4 3HH: before 2020SL4 3HJ: before 2020SL4 3HL: before 2020SL4 3HN: before 2020SL4 3HP: before 2020SL4 3HQ: before 2020SL4 3HR: before 2020SL4 3HS: before 2020SL4 3HU: before 2020SL4 3HW: before 2020SL4 3HY: before 2020SL4 3JA: before 2020SL4 3JB: before 2020SL4 3JD: before 2020SL4 3JE: before 2020SL4 3JF: before 2020SL4 3JG: before 2020SL4 3JH: before 2020SL4 3JJ: before 2020SL4 3JL: before 2020SL4 3JN: before 2020SL4 3JP: before 2020SL4 3JQ: before 2020SL4 3JR: before 2020SL4 3JS: before 2020SL4 3JU: before 2020SL4 3JW: before 2020SL4 3JX: before 2020SL4 3JY: before 2020SL4 3JZ: before 2020SL4 3LA: before 2020SL4 3LB: before 2020SL4 3LD: before 2020SL4 3LE: before 2020SL4 3LF: before 2020SL4 3LL: before 2020SL4 3LN: before 2020SL4 3LP: before 2020SL4 3LR: before 2020SL4 3LS: before 2020SL4 3LT: before 2020SL4 3LU: before 2020SL4 3LW: before 2020SL4 3LX: before 2020SL4 3LY: before 2020SL4 3LZ: before 2020SL4 3NA: before 2020SL4 3NB: before 2020SL4 3ND: before 2020SL4 3NE: before 2020SL4 3NF: before 2020SL4 3NG: before 2020SL4 3NH: before 2020SL4 3NJ: before 2020SL4 3NL: before 2020SL4 3NN: before 2020SL4 3NP: before 2020SL4 3NQ: before 2020SL4 3NT: before 2020SL4 3NU: before 2020SL4 3NW: before 2020SL4 3NX: before 2020SL4 3NY: before 2020SL4 3NZ: before 2020SL4 3PA: before 2020SL4 3PB: before 2020SL4 3PD: before 2020SL4 3PE: before 2020SL4 3PF: before 2020SL4 3PG: before 2020SL4 3PH: before 2020SL4 3PJ: before 2020SL4 3PL: before 2020SL4 3PN: before 2020SL4 3PP: before 2020SL4 3PQ: before 2020SL4 3PR: before 2020SL4 3PS: before 2020SL4 3PT: before 2020SL4 3PU: before 2020SL4 3PW: before 2020SL4 3PX: before 2020SL4 3PY: before 2020SL4 3PZ: before 2020SL4 3QA: before 2020SL4 3QB: before 2020SL4 3QD: before 2020SL4 3QE: before 2020SL4 3QF: before 2020SL4 3QN: before 2020SL4 3QP: before 2020SL4 3QQ: before 2020SL4 3QR: before 2020SL4 3QS: before 2020SL4 3QT: before 2020SL4 3QU: before 2020SL4 3QW: before 2020SL4 3QX: before 2020SL4 3QY: before 2020SL4 3QZ: before 2020SL4 3RA: before 2020SL4 3RB: before 2020SL4 3RD: before 2020SL4 3RE: before 2020SL4 3RF: before 2020SL4 3RG: before 2020SL4 3RH: before 2020SL4 3RJ: before 2020SL4 3RL: before 2020SL4 3RN: before 2020SL4 3RQ: before 2020SL4 3RR: before 2020SL4 3RT: before 2020SL4 3RU: before 2020SL4 3RW: before 2020SL4 3RX: before 2020SL4 3RY: before 2020SL4 3RZ: before 2020SL4 3SA: before 2020SL4 3SB: before 2020SL4 3SD: before 2020SL4 3SE: before 2020SL4 3SF: before 2020SL4 3SG: before 2020SL4 3SH: before 2020SL4 3SJ: before 2020SL4 3SL: before 2020SL4 3SQ: before 2020SL4 3SR: before 2020SL4 3SS: before 2020SL4 3ST: before 2020SL4 3SU: before 2020SL4 3SW: before 2020SL4 3SX: before 2020SL4 3SY: before 2020SL4 3SZ: before 2020SL4 3TA: before 2020SL4 3TD: before 2020SL4 3TH: before 2020SL4 3TN: before 2020SL4 3TP: before 2020SL4 3TQ: before 2020SL4 3TR: before 2020SL4 3TS: before 2020SL4 3TT: before 2020SL4 3TW: before 2020SL4 3UU: before 2020SL4 3WA: before 2020SL4 3WN: before 2020SL4 3YL: before 2020SL4 3FQ: new since 2020SL4 3SN: new since 2020SL4 3SP: new since 2020SL4 3TB: new since 2020SL4 3TE: new since 2020 Windsor Map of every postcode in the SL4 3 sector, by new since 2020 Of the 238 postcodes in the SL4 3 sector that ONS places, 5 are new since 2020 and 233 were in use before 2020. Places named: Windsor. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A332 Windsor
  • New since 2020: 5
  • In use before 2020: 233

Of the 238 postcodes in the SL4 3 sector that ONS places, 5 are new since 2020 and 233 were in use before 2020.

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. New since 2020 means it came into use in January 2020 or later. No boundary is drawn.

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; when each came into use: the same directory; 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 5 newest postcodes

SL4 3SPMarch 2024SL4 3TBOctober 2023SL4 3TEApril 2023SL4 3SNOctober 2022SL4 3FQFebruary 2022

What do homes sell for in SL4 3?

Homes in SL4 3 sold for a typical £430,000 in the 12 months to August 2026, across 97 sales, down 9.5% on the 12 months before, HM Land Registry's figures show.

£430,000 typical price, the 12 months to August 2026
£475,000 12 months to August 2025
▼ down 9.5% on the 12 months before
  • Detached £1,040,000 6 sales
  • Semi-detached £756,000 22 sales
  • Terraced £655,000 20 sales
  • Flat or maisonette £315,000 49 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 SL4 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 SL4 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.

SL4 3AASL4 3AESL4 3AGSL4 3AHSL4 3AJSL4 3ALSL4 3ANSL4 3APSL4 3AQSL4 3ARSL4 3ASSL4 3ATSL4 3AUSL4 3AXSL4 3AZSL4 3BASL4 3BBSL4 3BDSL4 3BESL4 3BGSL4 3BHSL4 3BJSL4 3BLSL4 3BNSL4 3BPSL4 3BQSL4 3BTSL4 3BUSL4 3BWSL4 3BXSL4 3BYSL4 3BZSL4 3DASL4 3DBSL4 3DDSL4 3DESL4 3DFSL4 3DGSL4 3DHSL4 3DJSL4 3DLSL4 3DNSL4 3DPSL4 3DQSL4 3DRSL4 3DSSL4 3DTSL4 3DUSL4 3DWSL4 3DXSL4 3DYSL4 3DZSL4 3EASL4 3EBSL4 3EDSL4 3EESL4 3EGSL4 3EHSL4 3ELSL4 3ENSL4 3EPSL4 3EQSL4 3ERSL4 3ESSL4 3ETSL4 3EUSL4 3EWSL4 3EXSL4 3EYSL4 3EZSL4 3FASL4 3FESL4 3FFSL4 3FGSL4 3FHSL4 3FJSL4 3FLSL4 3FPSL4 3FQSL4 3GZSL4 3HASL4 3HBSL4 3HDSL4 3HESL4 3HHSL4 3HJSL4 3HLSL4 3HNSL4 3HPSL4 3HQSL4 3HRSL4 3HSSL4 3HUSL4 3HWSL4 3HYSL4 3JASL4 3JBSL4 3JDSL4 3JESL4 3JFSL4 3JGSL4 3JHSL4 3JJSL4 3JLSL4 3JNSL4 3JPSL4 3JQSL4 3JRSL4 3JSSL4 3JUSL4 3JWSL4 3JXSL4 3JYSL4 3JZSL4 3LASL4 3LBSL4 3LDSL4 3LESL4 3LFSL4 3LLSL4 3LNSL4 3LPSL4 3LRSL4 3LSSL4 3LTSL4 3LUSL4 3LWSL4 3LXSL4 3LYSL4 3LZSL4 3NASL4 3NBSL4 3NDSL4 3NESL4 3NFSL4 3NGSL4 3NHSL4 3NJSL4 3NLSL4 3NNSL4 3NPSL4 3NQSL4 3NTSL4 3NUSL4 3NWSL4 3NXSL4 3NYSL4 3NZSL4 3PASL4 3PBSL4 3PDSL4 3PESL4 3PFSL4 3PGSL4 3PHSL4 3PJSL4 3PLSL4 3PNSL4 3PPSL4 3PQSL4 3PRSL4 3PSSL4 3PTSL4 3PUSL4 3PWSL4 3PXSL4 3PYSL4 3PZSL4 3QASL4 3QBSL4 3QDSL4 3QESL4 3QFSL4 3QNSL4 3QPSL4 3QQSL4 3QRSL4 3QSSL4 3QTSL4 3QUSL4 3QWSL4 3QXSL4 3QYSL4 3QZSL4 3RASL4 3RBSL4 3RDSL4 3RESL4 3RFSL4 3RGSL4 3RHSL4 3RJSL4 3RLSL4 3RNSL4 3RQSL4 3RRSL4 3RTSL4 3RUSL4 3RWSL4 3RXSL4 3RYSL4 3RZSL4 3SASL4 3SBSL4 3SDSL4 3SESL4 3SFSL4 3SGSL4 3SHSL4 3SJSL4 3SLSL4 3SNSL4 3SPSL4 3SQSL4 3SRSL4 3SSSL4 3STSL4 3SUSL4 3SWSL4 3SXSL4 3SYSL4 3SZSL4 3TASL4 3TBSL4 3TDSL4 3TESL4 3THSL4 3TNSL4 3TPSL4 3TQSL4 3TRSL4 3TSSL4 3TTSL4 3TWSL4 3UUSL4 3WASL4 3WNSL4 3YL

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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