SN1 4 postcode sector in the SN1 district

SN1 4 is a sector of the SN1 district: every postcode that starts SN1 4. It has 151 postcodes in use, one of them a large-user postcode. 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 SN1 4 sector, by flood risk

Map of every postcode in the SN1 4 sector, by flood risk Of the 151 postcodes in the SN1 4 sector that ONS places, 2 have a home or business at high risk and 149 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: Old Town & Lawn, Kingshill. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. M4 SN1 4AB: not on the flood risk listSN1 4AH: not on the flood risk listSN1 4AJ: not on the flood risk listSN1 4AL: not on the flood risk listSN1 4AN: not on the flood risk listSN1 4AQ: not on the flood risk listSN1 4AS: not on the flood risk listSN1 4AT: not on the flood risk listSN1 4AU: not on the flood risk listSN1 4AX: not on the flood risk listSN1 4AY: not on the flood risk listSN1 4BA: not on the flood risk listSN1 4BB: not on the flood risk listSN1 4BD: not on the flood risk listSN1 4BF: not on the flood risk listSN1 4BG: not on the flood risk listSN1 4BH: not on the flood risk listSN1 4BJ: not on the flood risk listSN1 4BL: not on the flood risk listSN1 4BP: not on the flood risk listSN1 4BQ: not on the flood risk listSN1 4BS: not on the flood risk listSN1 4BT: not on the flood risk listSN1 4BY: not on the flood risk listSN1 4BZ: not on the flood risk listSN1 4DA: not on the flood risk listSN1 4DB: not on the flood risk listSN1 4DD: not on the flood risk listSN1 4DE: not on the flood risk listSN1 4DF: not on the flood risk listSN1 4DG: not on the flood risk listSN1 4DH: not on the flood risk listSN1 4DJ: not on the flood risk listSN1 4DL: not on the flood risk listSN1 4DN: not on the flood risk listSN1 4DP: not on the flood risk listSN1 4DQ: not on the flood risk listSN1 4DR: not on the flood risk listSN1 4DS: not on the flood risk listSN1 4DT: not on the flood risk listSN1 4DU: not on the flood risk listSN1 4DW: not on the flood risk listSN1 4DX: not on the flood risk listSN1 4DY: not on the flood risk listSN1 4DZ: not on the flood risk listSN1 4EA: not on the flood risk listSN1 4EB: not on the flood risk listSN1 4ED: not on the flood risk listSN1 4EE: not on the flood risk listSN1 4EF: not on the flood risk listSN1 4EG: not on the flood risk listSN1 4EH: not on the flood risk listSN1 4EJ: not on the flood risk listSN1 4EL: not on the flood risk listSN1 4EN: not on the flood risk listSN1 4EP: not on the flood risk listSN1 4EQ: not on the flood risk listSN1 4ER: not on the flood risk listSN1 4ES: not on the flood risk listSN1 4ET: not on the flood risk listSN1 4EU: not on the flood risk listSN1 4EW: not on the flood risk listSN1 4EX: not on the flood risk listSN1 4EY: not on the flood risk listSN1 4EZ: not on the flood risk listSN1 4FE: not on the flood risk listSN1 4FF: not on the flood risk listSN1 4FZ: not on the flood risk listSN1 4GA: not on the flood risk listSN1 4GB: not on the flood risk listSN1 4GD: not on the flood risk listSN1 4GE: not on the flood risk listSN1 4GF: not on the flood risk listSN1 4GG: not on the flood risk listSN1 4GH: not on the flood risk listSN1 4GJ: not on the flood risk listSN1 4GL: not on the flood risk listSN1 4GN: not on the flood risk listSN1 4GP: not on the flood risk listSN1 4GQ: not on the flood risk listSN1 4GR: not on the flood risk listSN1 4GS: not on the flood risk listSN1 4GT: not on the flood risk listSN1 4GU: not on the flood risk listSN1 4GW: not on the flood risk listSN1 4GX: not on the flood risk listSN1 4GY: not on the flood risk listSN1 4GZ: not on the flood risk listSN1 4HB: not on the flood risk listSN1 4HD: not on the flood risk listSN1 4HE: not on the flood risk listSN1 4HF: not on the flood risk listSN1 4HG: not on the flood risk listSN1 4HH: not on the flood risk listSN1 4HJ: not on the flood risk listSN1 4HP: not on the flood risk listSN1 4HR: not on the flood risk listSN1 4HS: not on the flood risk listSN1 4HT: not on the flood risk listSN1 4HU: not on the flood risk listSN1 4HX: not on the flood risk listSN1 4HY: not on the flood risk listSN1 4JA: not on the flood risk listSN1 4JE: not on the flood risk listSN1 4JG: not on the flood risk listSN1 4JN: not on the flood risk listSN1 4JP: not on the flood risk listSN1 4JQ: not on the flood risk listSN1 4JS: not on the flood risk listSN1 4JT: not on the flood risk listSN1 4JW: not on the flood risk listSN1 4JX: not on the flood risk listSN1 4JY: not on the flood risk listSN1 4JZ: not on the flood risk listSN1 4LA: not on the flood risk listSN1 4LB: not on the flood risk listSN1 4LD: not on the flood risk listSN1 4LE: not on the flood risk listSN1 4LG: not on the flood risk listSN1 4LH: not on the flood risk listSN1 4LJ: not on the flood risk listSN1 4LL: not on the flood risk listSN1 4LN: not on the flood risk listSN1 4LP: not on the flood risk listSN1 4LQ: not on the flood risk listSN1 4LR: not on the flood risk listSN1 4LS: not on the flood risk listSN1 4LT: not on the flood risk listSN1 4LU: not on the flood risk listSN1 4LW: not on the flood risk listSN1 4LX: not on the flood risk listSN1 4LZ: not on the flood risk listSN1 4NA: not on the flood risk listSN1 4NB: not on the flood risk listSN1 4ND: not on the flood risk listSN1 4NE: not on the flood risk listSN1 4NG: not on the flood risk listSN1 4NH: not on the flood risk listSN1 4NJ: not on the flood risk listSN1 4NL: not on the flood risk listSN1 4NN: not on the flood risk listSN1 4NP: not on the flood risk listSN1 4NR: not on the flood risk listSN1 4NS: not on the flood risk listSN1 4PH: not on the flood risk listSN1 4PN: not on the flood risk listSN1 4PW: not on the flood risk listSN1 4RW: not on the flood risk listSN1 4AP: high flood riskSN1 4NQ: high flood risk Old Town & LawnKingshill Map of every postcode in the SN1 4 sector, by flood risk Of the 151 postcodes in the SN1 4 sector that ONS places, 2 have a home or business at high risk and 149 are not on the Environment Agency's at-risk list. One postcode lies beyond the edge and is listed under the map. Places named: Old Town & Lawn, Kingshill. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. M4 Old Town & LawnKingshill
  • A home or business at high risk: 2
  • At medium risk at worst: 0
  • At low risk at worst: 0
  • At very low risk only: 0
  • Not on the at-risk list: 149

Of the 151 postcodes in the SN1 4 sector that ONS places, 2 have a home or business at high risk and 149 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. 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.

SN1 4NQ12 at high riskSN1 4AP1 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.

SN1 4NT

What do homes sell for in SN1 4?

Homes in SN1 4 sold for a typical £275,000 in the 12 months to August 2026, across 108 sales, down 6.8% on the 12 months before, HM Land Registry's figures show.

£275,000 typical price, the 12 months to August 2026
£295,000 12 months to August 2025
▼ down 6.8% on the 12 months before
  • Detached £461,000 12 sales
  • Semi-detached £395,000 18 sales
  • Terraced £300,000 37 sales
  • Flat or maisonette £145,000 41 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 SN1 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 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 SN1 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.

SN1 4ABSN1 4AHSN1 4AJSN1 4ALSN1 4ANSN1 4APSN1 4AQSN1 4ASSN1 4ATSN1 4AUSN1 4AXSN1 4AYSN1 4BASN1 4BBSN1 4BDSN1 4BFSN1 4BGSN1 4BHSN1 4BJSN1 4BLSN1 4BPSN1 4BQSN1 4BSSN1 4BTSN1 4BYSN1 4BZSN1 4DASN1 4DBSN1 4DDSN1 4DESN1 4DFSN1 4DGSN1 4DHSN1 4DJSN1 4DLSN1 4DNSN1 4DPSN1 4DQSN1 4DRSN1 4DSSN1 4DTSN1 4DUSN1 4DWSN1 4DXSN1 4DYSN1 4DZSN1 4EASN1 4EBSN1 4EDSN1 4EESN1 4EFSN1 4EGSN1 4EHSN1 4EJSN1 4ELSN1 4ENSN1 4EPSN1 4EQSN1 4ERSN1 4ESSN1 4ETSN1 4EUSN1 4EWSN1 4EXSN1 4EYSN1 4EZSN1 4FESN1 4FFSN1 4FZSN1 4GASN1 4GBSN1 4GDSN1 4GESN1 4GFSN1 4GGSN1 4GHSN1 4GJSN1 4GLSN1 4GNSN1 4GPSN1 4GQSN1 4GRSN1 4GSSN1 4GTSN1 4GUSN1 4GWSN1 4GXSN1 4GYSN1 4GZSN1 4HBSN1 4HDSN1 4HESN1 4HFSN1 4HGSN1 4HHSN1 4HJSN1 4HPSN1 4HRSN1 4HSSN1 4HTSN1 4HUSN1 4HXSN1 4HYSN1 4JASN1 4JESN1 4JGSN1 4JNSN1 4JPSN1 4JQSN1 4JSSN1 4JTSN1 4JWSN1 4JXSN1 4JYSN1 4JZSN1 4LASN1 4LBSN1 4LDSN1 4LESN1 4LGSN1 4LHSN1 4LJSN1 4LLSN1 4LNSN1 4LPSN1 4LQSN1 4LRSN1 4LSSN1 4LTSN1 4LUSN1 4LWSN1 4LXSN1 4LZSN1 4NASN1 4NBSN1 4NDSN1 4NESN1 4NGSN1 4NHSN1 4NJSN1 4NLSN1 4NNSN1 4NPSN1 4NQSN1 4NRSN1 4NSSN1 4NTSN1 4PHSN1 4PNSN1 4PWSN1 4RW

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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