SL1 9 postcode sector in the SL1 district

SL1 9 is a sector of the SL1 district: every postcode that starts SL1 9. It has 57 postcodes in use, 2 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 9 sector, by flood risk

Map of every postcode in the SL1 9 sector, by flood risk Of the 57 postcodes in the SL1 9 sector that ONS places, 1 have a home or business at high risk, 1 are at medium risk at worst, 7 are at low risk at worst, 33 are at very low risk only and 15 are not on the Environment Agency's at-risk list. Places named: Cippenham Manor. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. M4 SL1 9AD: not on the flood risk listSL1 9AF: not on the flood risk listSL1 9AH: not on the flood risk listSL1 9AN: not on the flood risk listSL1 9AP: not on the flood risk listSL1 9AR: not on the flood risk listSL1 9AS: not on the flood risk listSL1 9AT: not on the flood risk listSL1 9AW: not on the flood risk listSL1 9DD: not on the flood risk listSL1 9DT: not on the flood risk listSL1 9DU: not on the flood risk listSL1 9DX: not on the flood risk listSL1 9JB: not on the flood risk listSL1 9LA: not on the flood risk listSL1 9AA: very low flood risk onlySL1 9AB: very low flood risk onlySL1 9AG: very low flood risk onlySL1 9AJ: very low flood risk onlySL1 9AQ: very low flood risk onlySL1 9BA: very low flood risk onlySL1 9BB: very low flood risk onlySL1 9BD: very low flood risk onlySL1 9BE: very low flood risk onlySL1 9BG: very low flood risk onlySL1 9BH: very low flood risk onlySL1 9BJ: very low flood risk onlySL1 9BN: very low flood risk onlySL1 9BQ: very low flood risk onlySL1 9BW: very low flood risk onlySL1 9DA: very low flood risk onlySL1 9DY: very low flood risk onlySL1 9DZ: very low flood risk onlySL1 9EB: very low flood risk onlySL1 9HA: very low flood risk onlySL1 9HB: very low flood risk onlySL1 9HD: very low flood risk onlySL1 9HE: very low flood risk onlySL1 9HJ: very low flood risk onlySL1 9HL: very low flood risk onlySL1 9HW: very low flood risk onlySL1 9JF: very low flood risk onlySL1 9JL: very low flood risk onlySL1 9JX: very low flood risk onlySL1 9JY: very low flood risk onlySL1 9JZ: very low flood risk onlySL1 9LB: very low flood risk onlySL1 9LD: very low flood risk onlySL1 9DE: low flood risk at worstSL1 9DJ: low flood risk at worstSL1 9DL: low flood risk at worstSL1 9DN: low flood risk at worstSL1 9DW: low flood risk at worstSL1 9HN: low flood risk at worstSL1 9JA: low flood risk at worstSL1 9DB: medium flood risk at worstSL1 9EA: high flood risk Cippenham Manor Map of every postcode in the SL1 9 sector, by flood risk Of the 57 postcodes in the SL1 9 sector that ONS places, 1 have a home or business at high risk, 1 are at medium risk at worst, 7 are at low risk at worst, 33 are at very low risk only and 15 are not on the Environment Agency's at-risk list. Places named: Cippenham Manor. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. M4 Cippenham Manor
  • A home or business at high risk: 1
  • At medium risk at worst: 1
  • At low risk at worst: 7
  • At very low risk only: 33
  • Not on the at-risk list: 15

Of the 57 postcodes in the SL1 9 sector that ONS places, 1 have a home or business at high risk, 1 are at medium risk at worst, 7 are at low risk at worst, 33 are at very low risk only and 15 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. Names in italics are council wards: we hold no town or village names here.

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 9EA3 at high risk

What do homes sell for in SL1 9?

Homes in SL1 9 sold for a typical £345,000 in the 12 months to August 2026, across 29 sales, down 2.5% on the 12 months before, HM Land Registry's figures show.

£345,000 typical price, the 12 months to August 2026
£354,000 12 months to August 2025
▼ down 2.5% on the 12 months before
  • Detached 1 sale, too few to price
  • Semi-detached £380,000 5 sales
  • Terraced £358,750 12 sales
  • Flat or maisonette £170,000 11 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 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 SL1 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.

SL1 9AASL1 9ABSL1 9ADSL1 9AFSL1 9AGSL1 9AHSL1 9AJSL1 9ANSL1 9APSL1 9AQSL1 9ARSL1 9ASSL1 9ATSL1 9AWSL1 9BASL1 9BBSL1 9BDSL1 9BESL1 9BGSL1 9BHSL1 9BJSL1 9BNSL1 9BQSL1 9BWSL1 9DASL1 9DBSL1 9DDSL1 9DESL1 9DJSL1 9DLSL1 9DNSL1 9DTSL1 9DUSL1 9DWSL1 9DXSL1 9DYSL1 9DZSL1 9EASL1 9EBSL1 9HASL1 9HBSL1 9HDSL1 9HESL1 9HJSL1 9HLSL1 9HNSL1 9HWSL1 9JASL1 9JBSL1 9JFSL1 9JLSL1 9JXSL1 9JYSL1 9JZSL1 9LASL1 9LBSL1 9LD

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.

Check a postcode

Something wrong on this page? Report an error and we will check it against the source.