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, and which are new since 2020

Map of every postcode in the SN1 4 sector, by new since 2020 Of the 151 postcodes in the SN1 4 sector that ONS places, 1 are new since 2020 and 150 were in use before 2020. 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: before 2020SN1 4AH: before 2020SN1 4AJ: before 2020SN1 4AL: before 2020SN1 4AN: before 2020SN1 4AP: before 2020SN1 4AQ: before 2020SN1 4AS: before 2020SN1 4AT: before 2020SN1 4AU: before 2020SN1 4AX: before 2020SN1 4AY: before 2020SN1 4BA: before 2020SN1 4BB: before 2020SN1 4BD: before 2020SN1 4BF: before 2020SN1 4BG: before 2020SN1 4BH: before 2020SN1 4BJ: before 2020SN1 4BL: before 2020SN1 4BP: before 2020SN1 4BQ: before 2020SN1 4BS: before 2020SN1 4BY: before 2020SN1 4BZ: before 2020SN1 4DA: before 2020SN1 4DB: before 2020SN1 4DD: before 2020SN1 4DE: before 2020SN1 4DF: before 2020SN1 4DG: before 2020SN1 4DH: before 2020SN1 4DJ: before 2020SN1 4DL: before 2020SN1 4DN: before 2020SN1 4DP: before 2020SN1 4DQ: before 2020SN1 4DR: before 2020SN1 4DS: before 2020SN1 4DT: before 2020SN1 4DU: before 2020SN1 4DW: before 2020SN1 4DX: before 2020SN1 4DY: before 2020SN1 4DZ: before 2020SN1 4EA: before 2020SN1 4EB: before 2020SN1 4ED: before 2020SN1 4EE: before 2020SN1 4EF: before 2020SN1 4EG: before 2020SN1 4EH: before 2020SN1 4EJ: before 2020SN1 4EL: before 2020SN1 4EN: before 2020SN1 4EP: before 2020SN1 4EQ: before 2020SN1 4ER: before 2020SN1 4ES: before 2020SN1 4ET: before 2020SN1 4EU: before 2020SN1 4EW: before 2020SN1 4EX: before 2020SN1 4EY: before 2020SN1 4EZ: before 2020SN1 4FE: before 2020SN1 4FF: before 2020SN1 4FZ: before 2020SN1 4GA: before 2020SN1 4GB: before 2020SN1 4GD: before 2020SN1 4GE: before 2020SN1 4GF: before 2020SN1 4GG: before 2020SN1 4GH: before 2020SN1 4GJ: before 2020SN1 4GL: before 2020SN1 4GN: before 2020SN1 4GP: before 2020SN1 4GQ: before 2020SN1 4GR: before 2020SN1 4GS: before 2020SN1 4GT: before 2020SN1 4GU: before 2020SN1 4GW: before 2020SN1 4GX: before 2020SN1 4GY: before 2020SN1 4GZ: before 2020SN1 4HB: before 2020SN1 4HD: before 2020SN1 4HE: before 2020SN1 4HF: before 2020SN1 4HG: before 2020SN1 4HH: before 2020SN1 4HJ: before 2020SN1 4HP: before 2020SN1 4HR: before 2020SN1 4HS: before 2020SN1 4HT: before 2020SN1 4HU: before 2020SN1 4HX: before 2020SN1 4HY: before 2020SN1 4JA: before 2020SN1 4JE: before 2020SN1 4JG: before 2020SN1 4JN: before 2020SN1 4JP: before 2020SN1 4JQ: before 2020SN1 4JS: before 2020SN1 4JT: before 2020SN1 4JW: before 2020SN1 4JX: before 2020SN1 4JY: before 2020SN1 4JZ: before 2020SN1 4LA: before 2020SN1 4LB: before 2020SN1 4LD: before 2020SN1 4LE: before 2020SN1 4LG: before 2020SN1 4LH: before 2020SN1 4LJ: before 2020SN1 4LL: before 2020SN1 4LN: before 2020SN1 4LP: before 2020SN1 4LQ: before 2020SN1 4LR: before 2020SN1 4LS: before 2020SN1 4LT: before 2020SN1 4LU: before 2020SN1 4LW: before 2020SN1 4LX: before 2020SN1 4LZ: before 2020SN1 4NA: before 2020SN1 4NB: before 2020SN1 4ND: before 2020SN1 4NE: before 2020SN1 4NG: before 2020SN1 4NH: before 2020SN1 4NJ: before 2020SN1 4NL: before 2020SN1 4NN: before 2020SN1 4NP: before 2020SN1 4NQ: before 2020SN1 4NR: before 2020SN1 4NS: before 2020SN1 4PH: before 2020SN1 4PN: before 2020SN1 4PW: before 2020SN1 4RW: before 2020SN1 4BT: new since 2020 Old Town & LawnKingshill Map of every postcode in the SN1 4 sector, by new since 2020 Of the 151 postcodes in the SN1 4 sector that ONS places, 1 are new since 2020 and 150 were in use before 2020. 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
  • New since 2020: 1
  • In use before 2020: 150

Of the 151 postcodes in the SN1 4 sector that ONS places, 1 are new since 2020 and 150 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. 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; 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 newest postcode

SN1 4BTOctober 2020

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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