SL9 9 postcode sector in the SL9 district

SL9 9 is a sector of the SL9 district: every postcode that starts SL9 9. It has 227 postcodes in use, 5 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 SL9 9 sector, by flood risk

Map of every postcode in the SL9 9 sector, by flood risk Of the 227 postcodes in the SL9 9 sector that ONS places, 1 have a home or business at high risk, 4 are at medium risk at worst, 19 are at low risk at worst and 203 are not on the Environment Agency's at-risk list. Places named: Chalfont St Peter. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A413 SL9 9AA: not on the flood risk listSL9 9AB: not on the flood risk listSL9 9AD: not on the flood risk listSL9 9AE: not on the flood risk listSL9 9AF: not on the flood risk listSL9 9AG: not on the flood risk listSL9 9AH: not on the flood risk listSL9 9AJ: not on the flood risk listSL9 9AQ: not on the flood risk listSL9 9AT: not on the flood risk listSL9 9AU: not on the flood risk listSL9 9AX: not on the flood risk listSL9 9AY: not on the flood risk listSL9 9AZ: not on the flood risk listSL9 9BA: not on the flood risk listSL9 9BB: not on the flood risk listSL9 9BD: not on the flood risk listSL9 9BE: not on the flood risk listSL9 9BG: not on the flood risk listSL9 9BH: not on the flood risk listSL9 9BJ: not on the flood risk listSL9 9BL: not on the flood risk listSL9 9BN: not on the flood risk listSL9 9BQ: not on the flood risk listSL9 9BW: not on the flood risk listSL9 9DA: not on the flood risk listSL9 9DB: not on the flood risk listSL9 9DD: not on the flood risk listSL9 9DE: not on the flood risk listSL9 9DG: not on the flood risk listSL9 9DH: not on the flood risk listSL9 9DJ: not on the flood risk listSL9 9DL: not on the flood risk listSL9 9DN: not on the flood risk listSL9 9DP: not on the flood risk listSL9 9DQ: not on the flood risk listSL9 9DR: not on the flood risk listSL9 9DS: not on the flood risk listSL9 9DT: not on the flood risk listSL9 9DU: not on the flood risk listSL9 9DW: not on the flood risk listSL9 9DX: not on the flood risk listSL9 9DY: not on the flood risk listSL9 9EA: not on the flood risk listSL9 9EB: not on the flood risk listSL9 9EH: not on the flood risk listSL9 9EN: not on the flood risk listSL9 9ER: not on the flood risk listSL9 9ES: not on the flood risk listSL9 9ET: not on the flood risk listSL9 9EU: not on the flood risk listSL9 9EW: not on the flood risk listSL9 9EX: not on the flood risk listSL9 9EY: not on the flood risk listSL9 9FB: not on the flood risk listSL9 9FD: not on the flood risk listSL9 9FE: not on the flood risk listSL9 9FF: not on the flood risk listSL9 9FH: not on the flood risk listSL9 9FJ: not on the flood risk listSL9 9FL: not on the flood risk listSL9 9FN: not on the flood risk listSL9 9FP: not on the flood risk listSL9 9FQ: not on the flood risk listSL9 9FR: not on the flood risk listSL9 9FS: not on the flood risk listSL9 9FT: not on the flood risk listSL9 9FU: not on the flood risk listSL9 9FW: not on the flood risk listSL9 9FX: not on the flood risk listSL9 9HA: not on the flood risk listSL9 9HB: not on the flood risk listSL9 9HE: not on the flood risk listSL9 9HG: not on the flood risk listSL9 9HH: not on the flood risk listSL9 9HJ: not on the flood risk listSL9 9HL: not on the flood risk listSL9 9HN: not on the flood risk listSL9 9HP: not on the flood risk listSL9 9HQ: not on the flood risk listSL9 9HR: not on the flood risk listSL9 9HS: not on the flood risk listSL9 9HT: not on the flood risk listSL9 9HU: not on the flood risk listSL9 9HW: not on the flood risk listSL9 9HX: not on the flood risk listSL9 9HY: not on the flood risk listSL9 9HZ: not on the flood risk listSL9 9JA: not on the flood risk listSL9 9JB: not on the flood risk listSL9 9JD: not on the flood risk listSL9 9JE: not on the flood risk listSL9 9JF: not on the flood risk listSL9 9JG: not on the flood risk listSL9 9JH: not on the flood risk listSL9 9JJ: not on the flood risk listSL9 9JQ: not on the flood risk listSL9 9JR: not on the flood risk listSL9 9JS: not on the flood risk listSL9 9JU: not on the flood risk listSL9 9JY: not on the flood risk listSL9 9JZ: not on the flood risk listSL9 9LB: not on the flood risk listSL9 9LD: not on the flood risk listSL9 9LE: not on the flood risk listSL9 9LF: not on the flood risk listSL9 9LG: not on the flood risk listSL9 9LH: not on the flood risk listSL9 9LJ: not on the flood risk listSL9 9LL: not on the flood risk listSL9 9LN: not on the flood risk listSL9 9LQ: not on the flood risk listSL9 9LR: not on the flood risk listSL9 9LS: not on the flood risk listSL9 9LT: not on the flood risk listSL9 9LU: not on the flood risk listSL9 9LW: not on the flood risk listSL9 9LX: not on the flood risk listSL9 9LY: not on the flood risk listSL9 9LZ: not on the flood risk listSL9 9NA: not on the flood risk listSL9 9NB: not on the flood risk listSL9 9ND: not on the flood risk listSL9 9NE: not on the flood risk listSL9 9NF: not on the flood risk listSL9 9NJ: not on the flood risk listSL9 9NL: not on the flood risk listSL9 9NN: not on the flood risk listSL9 9NP: not on the flood risk listSL9 9NR: not on the flood risk listSL9 9NS: not on the flood risk listSL9 9NT: not on the flood risk listSL9 9NU: not on the flood risk listSL9 9NW: not on the flood risk listSL9 9NX: not on the flood risk listSL9 9NY: not on the flood risk listSL9 9NZ: not on the flood risk listSL9 9PA: not on the flood risk listSL9 9PB: not on the flood risk listSL9 9PD: not on the flood risk listSL9 9PE: not on the flood risk listSL9 9PF: not on the flood risk listSL9 9PG: not on the flood risk listSL9 9PH: not on the flood risk listSL9 9PJ: not on the flood risk listSL9 9PL: not on the flood risk listSL9 9PN: not on the flood risk listSL9 9PP: not on the flood risk listSL9 9PQ: not on the flood risk listSL9 9PR: not on the flood risk listSL9 9PW: not on the flood risk listSL9 9QP: not on the flood risk listSL9 9QR: not on the flood risk listSL9 9QS: not on the flood risk listSL9 9QT: not on the flood risk listSL9 9QU: not on the flood risk listSL9 9RE: not on the flood risk listSL9 9RF: not on the flood risk listSL9 9RL: not on the flood risk listSL9 9RN: not on the flood risk listSL9 9RP: not on the flood risk listSL9 9RR: not on the flood risk listSL9 9RU: not on the flood risk listSL9 9RY: not on the flood risk listSL9 9RZ: not on the flood risk listSL9 9SA: not on the flood risk listSL9 9SB: not on the flood risk listSL9 9SD: not on the flood risk listSL9 9SE: not on the flood risk listSL9 9SF: not on the flood risk listSL9 9SG: not on the flood risk listSL9 9SH: not on the flood risk listSL9 9SJ: not on the flood risk listSL9 9SL: not on the flood risk listSL9 9SN: not on the flood risk listSL9 9SP: not on the flood risk listSL9 9SQ: not on the flood risk listSL9 9SR: not on the flood risk listSL9 9SS: not on the flood risk listSL9 9SW: not on the flood risk listSL9 9SX: not on the flood risk listSL9 9SY: not on the flood risk listSL9 9SZ: not on the flood risk listSL9 9TB: not on the flood risk listSL9 9TD: not on the flood risk listSL9 9TF: not on the flood risk listSL9 9TG: not on the flood risk listSL9 9TH: not on the flood risk listSL9 9TJ: not on the flood risk listSL9 9TL: not on the flood risk listSL9 9TQ: not on the flood risk listSL9 9TR: not on the flood risk listSL9 9TS: not on the flood risk listSL9 9TT: not on the flood risk listSL9 9TU: not on the flood risk listSL9 9TX: not on the flood risk listSL9 9TY: not on the flood risk listSL9 9TZ: not on the flood risk listSL9 9UA: not on the flood risk listSL9 9UB: not on the flood risk listSL9 9UD: not on the flood risk listSL9 9UP: not on the flood risk listSL9 9AL: low flood risk at worstSL9 9AP: low flood risk at worstSL9 9AR: low flood risk at worstSL9 9AS: low flood risk at worstSL9 9EQ: low flood risk at worstSL9 9FG: low flood risk at worstSL9 9JT: low flood risk at worstSL9 9QA: low flood risk at worstSL9 9QH: low flood risk at worstSL9 9QJ: low flood risk at worstSL9 9QL: low flood risk at worstSL9 9QQ: low flood risk at worstSL9 9RA: low flood risk at worstSL9 9RJ: low flood risk at worstSL9 9RS: low flood risk at worstSL9 9TA: low flood risk at worstSL9 9TW: low flood risk at worstSL9 9UE: low flood risk at worstSL9 9YZ: low flood risk at worstSL9 9AW: medium flood risk at worstSL9 9QE: medium flood risk at worstSL9 9TP: medium flood risk at worstSL9 9UL: medium flood risk at worstSL9 9QX: high flood risk Chalfont St Peter Map of every postcode in the SL9 9 sector, by flood risk Of the 227 postcodes in the SL9 9 sector that ONS places, 1 have a home or business at high risk, 4 are at medium risk at worst, 19 are at low risk at worst and 203 are not on the Environment Agency's at-risk list. Places named: Chalfont St Peter. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Chalfont St Peter
  • A home or business at high risk: 1
  • At medium risk at worst: 4
  • At low risk at worst: 19
  • At very low risk only: 0
  • Not on the at-risk list: 203

Of the 227 postcodes in the SL9 9 sector that ONS places, 1 have a home or business at high risk, 4 are at medium risk at worst, 19 are at low risk at worst and 203 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.

SL9 9QX3 at high risk

What do homes sell for in SL9 9?

Homes in SL9 9 sold for a typical £702,750 in the 12 months to August 2026, across 82 sales, up 11.5% on the 12 months before, HM Land Registry's figures show.

£702,750 typical price, the 12 months to August 2026
£630,000 12 months to August 2025
▲ up 11.5% on the 12 months before
  • Detached £942,500 32 sales
  • Semi-detached £708,000 19 sales
  • Terraced £551,250 14 sales
  • Flat or maisonette £338,000 17 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 SL9 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 SL9 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.

SL9 9AASL9 9ABSL9 9ADSL9 9AESL9 9AFSL9 9AGSL9 9AHSL9 9AJSL9 9ALSL9 9APSL9 9AQSL9 9ARSL9 9ASSL9 9ATSL9 9AUSL9 9AWSL9 9AXSL9 9AYSL9 9AZSL9 9BASL9 9BBSL9 9BDSL9 9BESL9 9BGSL9 9BHSL9 9BJSL9 9BLSL9 9BNSL9 9BQSL9 9BWSL9 9DASL9 9DBSL9 9DDSL9 9DESL9 9DGSL9 9DHSL9 9DJSL9 9DLSL9 9DNSL9 9DPSL9 9DQSL9 9DRSL9 9DSSL9 9DTSL9 9DUSL9 9DWSL9 9DXSL9 9DYSL9 9DZSL9 9EASL9 9EBSL9 9EHSL9 9ENSL9 9EQSL9 9ERSL9 9ESSL9 9ETSL9 9EUSL9 9EWSL9 9EXSL9 9EYSL9 9FBSL9 9FDSL9 9FESL9 9FFSL9 9FGSL9 9FHSL9 9FJSL9 9FLSL9 9FNSL9 9FPSL9 9FQSL9 9FRSL9 9FSSL9 9FTSL9 9FUSL9 9FWSL9 9FXSL9 9HASL9 9HBSL9 9HESL9 9HGSL9 9HHSL9 9HJSL9 9HLSL9 9HNSL9 9HPSL9 9HQSL9 9HRSL9 9HSSL9 9HTSL9 9HUSL9 9HWSL9 9HXSL9 9HYSL9 9HZSL9 9JASL9 9JBSL9 9JDSL9 9JESL9 9JFSL9 9JGSL9 9JHSL9 9JJSL9 9JQSL9 9JRSL9 9JSSL9 9JTSL9 9JUSL9 9JYSL9 9JZSL9 9LBSL9 9LDSL9 9LESL9 9LFSL9 9LGSL9 9LHSL9 9LJSL9 9LLSL9 9LNSL9 9LQSL9 9LRSL9 9LSSL9 9LTSL9 9LUSL9 9LWSL9 9LXSL9 9LYSL9 9LZSL9 9NASL9 9NBSL9 9NDSL9 9NESL9 9NFSL9 9NJSL9 9NLSL9 9NNSL9 9NPSL9 9NRSL9 9NSSL9 9NTSL9 9NUSL9 9NWSL9 9NXSL9 9NYSL9 9NZSL9 9PASL9 9PBSL9 9PDSL9 9PESL9 9PFSL9 9PGSL9 9PHSL9 9PJSL9 9PLSL9 9PNSL9 9PPSL9 9PQSL9 9PRSL9 9PWSL9 9QASL9 9QESL9 9QHSL9 9QJSL9 9QLSL9 9QPSL9 9QQSL9 9QRSL9 9QSSL9 9QTSL9 9QUSL9 9QXSL9 9RASL9 9RESL9 9RFSL9 9RJSL9 9RLSL9 9RNSL9 9RPSL9 9RRSL9 9RSSL9 9RUSL9 9RYSL9 9RZSL9 9SASL9 9SBSL9 9SDSL9 9SESL9 9SFSL9 9SGSL9 9SHSL9 9SJSL9 9SLSL9 9SNSL9 9SPSL9 9SQSL9 9SRSL9 9SSSL9 9SWSL9 9SXSL9 9SYSL9 9SZSL9 9TASL9 9TBSL9 9TDSL9 9TFSL9 9TGSL9 9THSL9 9TJSL9 9TLSL9 9TPSL9 9TQSL9 9TRSL9 9TSSL9 9TTSL9 9TUSL9 9TWSL9 9TXSL9 9TYSL9 9TZSL9 9UASL9 9UBSL9 9UDSL9 9UESL9 9ULSL9 9UPSL9 9YZ

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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