SN3 4 postcode sector in the SN3 district

SN3 4 is a sector of the SN3 district: every postcode that starts SN3 4. It has 332 postcodes in use, 7 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 SN3 4 sector, by flood risk

Map of every postcode in the SN3 4 sector, by flood risk Of the 332 postcodes in the SN3 4 sector that ONS places, 10 have a home or business at high risk, 3 are at medium risk at worst, 3 are at low risk at worst and 316 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 6 postcodes at high or medium risk. 2 postcodes lie beyond the edge and are listed under the map. Places named: Stratton St Margaret. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A420A419A361 SN3 4AA: not on the flood risk listSN3 4AB: not on the flood risk listSN3 4AD: not on the flood risk listSN3 4AE: not on the flood risk listSN3 4AF: not on the flood risk listSN3 4AG: not on the flood risk listSN3 4AJ: not on the flood risk listSN3 4AL: not on the flood risk listSN3 4AN: not on the flood risk listSN3 4AP: not on the flood risk listSN3 4AQ: not on the flood risk listSN3 4AR: not on the flood risk listSN3 4AS: not on the flood risk listSN3 4AT: not on the flood risk listSN3 4AU: not on the flood risk listSN3 4AW: not on the flood risk listSN3 4AX: not on the flood risk listSN3 4AY: not on the flood risk listSN3 4AZ: not on the flood risk listSN3 4BA: not on the flood risk listSN3 4BB: not on the flood risk listSN3 4BD: not on the flood risk listSN3 4BE: not on the flood risk listSN3 4BF: not on the flood risk listSN3 4BG: not on the flood risk listSN3 4BH: not on the flood risk listSN3 4BN: not on the flood risk listSN3 4BP: not on the flood risk listSN3 4BQ: not on the flood risk listSN3 4BS: not on the flood risk listSN3 4BT: not on the flood risk listSN3 4BU: not on the flood risk listSN3 4BW: not on the flood risk listSN3 4BY: not on the flood risk listSN3 4BZ: not on the flood risk listSN3 4DA: not on the flood risk listSN3 4DB: not on the flood risk listSN3 4DD: not on the flood risk listSN3 4DE: not on the flood risk listSN3 4DF: not on the flood risk listSN3 4DH: not on the flood risk listSN3 4DJ: not on the flood risk listSN3 4DL: not on the flood risk listSN3 4DN: not on the flood risk listSN3 4DP: not on the flood risk listSN3 4DQ: not on the flood risk listSN3 4DR: not on the flood risk listSN3 4DS: not on the flood risk listSN3 4DT: not on the flood risk listSN3 4DU: not on the flood risk listSN3 4DW: not on the flood risk listSN3 4DX: not on the flood risk listSN3 4DY: not on the flood risk listSN3 4DZ: not on the flood risk listSN3 4EA: not on the flood risk listSN3 4EB: not on the flood risk listSN3 4ED: not on the flood risk listSN3 4EE: not on the flood risk listSN3 4EF: not on the flood risk listSN3 4EG: not on the flood risk listSN3 4EH: not on the flood risk listSN3 4EL: not on the flood risk listSN3 4EN: not on the flood risk listSN3 4EP: not on the flood risk listSN3 4EQ: not on the flood risk listSN3 4ER: not on the flood risk listSN3 4ES: not on the flood risk listSN3 4ET: not on the flood risk listSN3 4EU: not on the flood risk listSN3 4EW: not on the flood risk listSN3 4EX: not on the flood risk listSN3 4EY: not on the flood risk listSN3 4EZ: not on the flood risk listSN3 4FA: not on the flood risk listSN3 4FD: not on the flood risk listSN3 4FE: not on the flood risk listSN3 4FF: not on the flood risk listSN3 4FG: not on the flood risk listSN3 4FH: not on the flood risk listSN3 4FJ: not on the flood risk listSN3 4FL: not on the flood risk listSN3 4FN: not on the flood risk listSN3 4FQ: not on the flood risk listSN3 4FR: not on the flood risk listSN3 4FW: not on the flood risk listSN3 4FX: not on the flood risk listSN3 4FY: not on the flood risk listSN3 4GA: not on the flood risk listSN3 4GF: not on the flood risk listSN3 4GG: not on the flood risk listSN3 4GH: not on the flood risk listSN3 4GJ: not on the flood risk listSN3 4GL: not on the flood risk listSN3 4GQ: not on the flood risk listSN3 4GR: not on the flood risk listSN3 4GU: not on the flood risk listSN3 4HA: not on the flood risk listSN3 4HB: not on the flood risk listSN3 4HD: not on the flood risk listSN3 4HE: not on the flood risk listSN3 4HF: not on the flood risk listSN3 4HG: not on the flood risk listSN3 4HH: not on the flood risk listSN3 4HJ: not on the flood risk listSN3 4HL: not on the flood risk listSN3 4HN: not on the flood risk listSN3 4HP: not on the flood risk listSN3 4HQ: not on the flood risk listSN3 4HR: not on the flood risk listSN3 4HS: not on the flood risk listSN3 4HT: not on the flood risk listSN3 4HU: not on the flood risk listSN3 4HW: not on the flood risk listSN3 4HX: not on the flood risk listSN3 4HY: not on the flood risk listSN3 4HZ: not on the flood risk listSN3 4JA: not on the flood risk listSN3 4JB: not on the flood risk listSN3 4JD: not on the flood risk listSN3 4JE: not on the flood risk listSN3 4JG: not on the flood risk listSN3 4JH: not on the flood risk listSN3 4JJ: not on the flood risk listSN3 4JL: not on the flood risk listSN3 4JN: not on the flood risk listSN3 4JP: not on the flood risk listSN3 4JQ: not on the flood risk listSN3 4JR: not on the flood risk listSN3 4JS: not on the flood risk listSN3 4JT: not on the flood risk listSN3 4JU: not on the flood risk listSN3 4JW: not on the flood risk listSN3 4JX: not on the flood risk listSN3 4JY: not on the flood risk listSN3 4JZ: not on the flood risk listSN3 4LA: not on the flood risk listSN3 4LB: not on the flood risk listSN3 4LD: not on the flood risk listSN3 4LE: not on the flood risk listSN3 4LF: not on the flood risk listSN3 4LG: not on the flood risk listSN3 4LH: not on the flood risk listSN3 4LJ: not on the flood risk listSN3 4LL: not on the flood risk listSN3 4LN: not on the flood risk listSN3 4LQ: not on the flood risk listSN3 4LR: not on the flood risk listSN3 4LS: not on the flood risk listSN3 4LT: not on the flood risk listSN3 4LU: not on the flood risk listSN3 4LW: not on the flood risk listSN3 4LX: not on the flood risk listSN3 4LY: not on the flood risk listSN3 4LZ: not on the flood risk listSN3 4NA: not on the flood risk listSN3 4NB: not on the flood risk listSN3 4ND: not on the flood risk listSN3 4NE: not on the flood risk listSN3 4NF: not on the flood risk listSN3 4NG: not on the flood risk listSN3 4NH: not on the flood risk listSN3 4NJ: not on the flood risk listSN3 4NL: not on the flood risk listSN3 4NN: not on the flood risk listSN3 4NP: not on the flood risk listSN3 4NQ: not on the flood risk listSN3 4NR: not on the flood risk listSN3 4NS: not on the flood risk listSN3 4NT: not on the flood risk listSN3 4NU: not on the flood risk listSN3 4NW: not on the flood risk listSN3 4NX: not on the flood risk listSN3 4NY: not on the flood risk listSN3 4NZ: not on the flood risk listSN3 4PA: not on the flood risk listSN3 4PB: not on the flood risk listSN3 4PD: not on the flood risk listSN3 4PE: not on the flood risk listSN3 4PF: not on the flood risk listSN3 4PG: not on the flood risk listSN3 4PH: not on the flood risk listSN3 4PJ: not on the flood risk listSN3 4PL: not on the flood risk listSN3 4PN: not on the flood risk listSN3 4PP: not on the flood risk listSN3 4PQ: not on the flood risk listSN3 4PR: not on the flood risk listSN3 4PS: not on the flood risk listSN3 4PT: not on the flood risk listSN3 4PU: not on the flood risk listSN3 4PW: not on the flood risk listSN3 4PY: not on the flood risk listSN3 4PZ: not on the flood risk listSN3 4QA: not on the flood risk listSN3 4QB: not on the flood risk listSN3 4QD: not on the flood risk listSN3 4QF: not on the flood risk listSN3 4QG: not on the flood risk listSN3 4QH: not on the flood risk listSN3 4QL: not on the flood risk listSN3 4QN: not on the flood risk listSN3 4QP: not on the flood risk listSN3 4QQ: not on the flood risk listSN3 4QR: not on the flood risk listSN3 4QS: not on the flood risk listSN3 4QT: not on the flood risk listSN3 4QW: not on the flood risk listSN3 4QX: not on the flood risk listSN3 4QY: not on the flood risk listSN3 4QZ: not on the flood risk listSN3 4RB: not on the flood risk listSN3 4RG: not on the flood risk listSN3 4RH: not on the flood risk listSN3 4RJ: not on the flood risk listSN3 4RL: not on the flood risk listSN3 4RN: not on the flood risk listSN3 4RP: not on the flood risk listSN3 4RQ: not on the flood risk listSN3 4RR: not on the flood risk listSN3 4RS: not on the flood risk listSN3 4RT: not on the flood risk listSN3 4RU: not on the flood risk listSN3 4RX: not on the flood risk listSN3 4RY: not on the flood risk listSN3 4RZ: not on the flood risk listSN3 4SA: not on the flood risk listSN3 4SB: not on the flood risk listSN3 4SG: not on the flood risk listSN3 4SH: not on the flood risk listSN3 4SJ: not on the flood risk listSN3 4SN: not on the flood risk listSN3 4SS: not on the flood risk listSN3 4ST: not on the flood risk listSN3 4SY: not on the flood risk listSN3 4SZ: not on the flood risk listSN3 4TA: not on the flood risk listSN3 4TB: not on the flood risk listSN3 4TD: not on the flood risk listSN3 4TE: not on the flood risk listSN3 4TF: not on the flood risk listSN3 4TG: not on the flood risk listSN3 4TJ: not on the flood risk listSN3 4TL: not on the flood risk listSN3 4TN: not on the flood risk listSN3 4TP: not on the flood risk listSN3 4TQ: not on the flood risk listSN3 4TR: not on the flood risk listSN3 4TS: not on the flood risk listSN3 4TT: not on the flood risk listSN3 4TU: not on the flood risk listSN3 4TW: not on the flood risk listSN3 4TX: not on the flood risk listSN3 4TY: not on the flood risk listSN3 4UA: not on the flood risk listSN3 4UB: not on the flood risk listSN3 4UD: not on the flood risk listSN3 4UE: not on the flood risk listSN3 4UF: not on the flood risk listSN3 4UG: not on the flood risk listSN3 4UH: not on the flood risk listSN3 4UJ: not on the flood risk listSN3 4UL: not on the flood risk listSN3 4UN: not on the flood risk listSN3 4UQ: not on the flood risk listSN3 4UR: not on the flood risk listSN3 4US: not on the flood risk listSN3 4UU: not on the flood risk listSN3 4UW: not on the flood risk listSN3 4UX: not on the flood risk listSN3 4UY: not on the flood risk listSN3 4UZ: not on the flood risk listSN3 4WA: not on the flood risk listSN3 4WB: not on the flood risk listSN3 4WD: not on the flood risk listSN3 4WE: not on the flood risk listSN3 4WF: not on the flood risk listSN3 4WH: not on the flood risk listSN3 4WQ: not on the flood risk listSN3 4WT: not on the flood risk listSN3 4WZ: not on the flood risk listSN3 4XA: not on the flood risk listSN3 4XB: not on the flood risk listSN3 4XD: not on the flood risk listSN3 4XE: not on the flood risk listSN3 4XF: not on the flood risk listSN3 4XG: not on the flood risk listSN3 4XH: not on the flood risk listSN3 4XL: not on the flood risk listSN3 4XN: not on the flood risk listSN3 4XP: not on the flood risk listSN3 4XQ: not on the flood risk listSN3 4XR: not on the flood risk listSN3 4XS: not on the flood risk listSN3 4XT: not on the flood risk listSN3 4XU: not on the flood risk listSN3 4XW: not on the flood risk listSN3 4XX: not on the flood risk listSN3 4XY: not on the flood risk listSN3 4XZ: not on the flood risk listSN3 4YA: not on the flood risk listSN3 4YB: not on the flood risk listSN3 4YD: not on the flood risk listSN3 4YE: not on the flood risk listSN3 4YF: not on the flood risk listSN3 4YH: not on the flood risk listSN3 4YQ: not on the flood risk listSN3 4ZN: not on the flood risk listSN3 4ZX: not on the flood risk listSN3 4ZY: not on the flood risk listSN3 4ZZ: not on the flood risk listSN3 4SL: low flood risk at worstSN3 4SU: low flood risk at worstSN3 4SW: low flood risk at worstSN3 4AH: medium flood risk at worstSN3 4BL: medium flood risk at worstSN3 4SP: medium flood risk at worstSN3 4BJ: high flood riskSN3 4BX: high flood riskSN3 4EJ: high flood riskSN3 4SD: high flood riskSN3 4SE: high flood riskSN3 4SF: high flood riskSN3 4SQ: high flood riskSN3 4SR: high flood riskSN3 4TH: high flood riskSN3 4UP: high flood risk Stratton St Margaret 6 postcodes at high or medium risk, outlined: this goes to SN3 4SF, the one with most homes and businesses at high risk6 postcodes at high or medium risk Map of every postcode in the SN3 4 sector, by flood risk Of the 332 postcodes in the SN3 4 sector that ONS places, 10 have a home or business at high risk, 3 are at medium risk at worst, 3 are at low risk at worst and 316 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 6 postcodes at high or medium risk. 2 postcodes lie beyond the edge and are listed under the map. Places named: Stratton St Margaret. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. A420 Stratton St Margaret
  • A home or business at high risk: 10
  • At medium risk at worst: 3
  • At low risk at worst: 3
  • At very low risk only: 0
  • Not on the at-risk list: 316
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 332 postcodes in the SN3 4 sector that ONS places, 10 have a home or business at high risk, 3 are at medium risk at worst, 3 are at low risk at worst and 316 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. A dashed outline shows where 5 or more lie within 160 metres of each other. It is not a boundary, and 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.

SN3 4SF13 at high riskSN3 4SQ8 at high riskSN3 4UP5 at high riskSN3 4BX2 at high riskSN3 4SD2 at high riskSN3 4TH2 at high riskSN3 4BJ1 at high riskSN3 4SE1 at high riskSN3 4EJ1 at high riskSN3 4SR1 at high risk

2 further out, not drawn

These postcodes lie well apart from the rest, so the map is drawn without them to show the rest closer; they are in every count.

SN3 4FBSN3 4SX

Where the postcodes at high or medium risk lie together

  • 6 postcodes at high or medium risk, outlined on the map. SN3 4SF, is the one with most homes and businesses at high risk.

What do homes sell for in SN3 4?

Homes in SN3 4 sold for a typical £300,000 in the 12 months to August 2026, across 178 sales, no change on the 12 months before, HM Land Registry's figures show.

£300,000 typical price, the 12 months to August 2026
£300,000 12 months to August 2025
■ no change on the 12 months before
  • Detached £422,500 32 sales
  • Semi-detached £310,000 80 sales
  • Terraced £280,000 43 sales
  • Flat or maisonette £143,000 23 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 SN3 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 SN3 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.

SN3 4AASN3 4ABSN3 4ADSN3 4AESN3 4AFSN3 4AGSN3 4AHSN3 4AJSN3 4ALSN3 4ANSN3 4APSN3 4AQSN3 4ARSN3 4ASSN3 4ATSN3 4AUSN3 4AWSN3 4AXSN3 4AYSN3 4AZSN3 4BASN3 4BBSN3 4BDSN3 4BESN3 4BFSN3 4BGSN3 4BHSN3 4BJSN3 4BLSN3 4BNSN3 4BPSN3 4BQSN3 4BSSN3 4BTSN3 4BUSN3 4BWSN3 4BXSN3 4BYSN3 4BZSN3 4DASN3 4DBSN3 4DDSN3 4DESN3 4DFSN3 4DHSN3 4DJSN3 4DLSN3 4DNSN3 4DPSN3 4DQSN3 4DRSN3 4DSSN3 4DTSN3 4DUSN3 4DWSN3 4DXSN3 4DYSN3 4DZSN3 4EASN3 4EBSN3 4EDSN3 4EESN3 4EFSN3 4EGSN3 4EHSN3 4EJSN3 4ELSN3 4ENSN3 4EPSN3 4EQSN3 4ERSN3 4ESSN3 4ETSN3 4EUSN3 4EWSN3 4EXSN3 4EYSN3 4EZSN3 4FASN3 4FBSN3 4FDSN3 4FESN3 4FFSN3 4FGSN3 4FHSN3 4FJSN3 4FLSN3 4FNSN3 4FQSN3 4FRSN3 4FSSN3 4FWSN3 4FXSN3 4FYSN3 4GASN3 4GDSN3 4GFSN3 4GGSN3 4GHSN3 4GJSN3 4GLSN3 4GQSN3 4GRSN3 4GUSN3 4HASN3 4HBSN3 4HDSN3 4HESN3 4HFSN3 4HGSN3 4HHSN3 4HJSN3 4HLSN3 4HNSN3 4HPSN3 4HQSN3 4HRSN3 4HSSN3 4HTSN3 4HUSN3 4HWSN3 4HXSN3 4HYSN3 4HZSN3 4JASN3 4JBSN3 4JDSN3 4JESN3 4JGSN3 4JHSN3 4JJSN3 4JLSN3 4JNSN3 4JPSN3 4JQSN3 4JRSN3 4JSSN3 4JTSN3 4JUSN3 4JWSN3 4JXSN3 4JYSN3 4JZSN3 4LASN3 4LBSN3 4LDSN3 4LESN3 4LFSN3 4LGSN3 4LHSN3 4LJSN3 4LLSN3 4LNSN3 4LQSN3 4LRSN3 4LSSN3 4LTSN3 4LUSN3 4LWSN3 4LXSN3 4LYSN3 4LZSN3 4NASN3 4NBSN3 4NDSN3 4NESN3 4NFSN3 4NGSN3 4NHSN3 4NJSN3 4NLSN3 4NNSN3 4NPSN3 4NQSN3 4NRSN3 4NSSN3 4NTSN3 4NUSN3 4NWSN3 4NXSN3 4NYSN3 4NZSN3 4PASN3 4PBSN3 4PDSN3 4PESN3 4PFSN3 4PGSN3 4PHSN3 4PJSN3 4PLSN3 4PNSN3 4PPSN3 4PQSN3 4PRSN3 4PSSN3 4PTSN3 4PUSN3 4PWSN3 4PYSN3 4PZSN3 4QASN3 4QBSN3 4QDSN3 4QFSN3 4QGSN3 4QHSN3 4QLSN3 4QNSN3 4QPSN3 4QQSN3 4QRSN3 4QSSN3 4QTSN3 4QUSN3 4QWSN3 4QXSN3 4QYSN3 4QZSN3 4RBSN3 4RGSN3 4RHSN3 4RJSN3 4RLSN3 4RNSN3 4RPSN3 4RQSN3 4RRSN3 4RSSN3 4RTSN3 4RUSN3 4RXSN3 4RYSN3 4RZSN3 4SASN3 4SBSN3 4SDSN3 4SESN3 4SFSN3 4SGSN3 4SHSN3 4SJSN3 4SLSN3 4SNSN3 4SPSN3 4SQSN3 4SRSN3 4SSSN3 4STSN3 4SUSN3 4SWSN3 4SXSN3 4SYSN3 4SZSN3 4TASN3 4TBSN3 4TDSN3 4TESN3 4TFSN3 4TGSN3 4THSN3 4TJSN3 4TLSN3 4TNSN3 4TPSN3 4TQSN3 4TRSN3 4TSSN3 4TTSN3 4TUSN3 4TWSN3 4TXSN3 4TYSN3 4UASN3 4UBSN3 4UDSN3 4UESN3 4UFSN3 4UGSN3 4UHSN3 4UJSN3 4ULSN3 4UNSN3 4UPSN3 4UQSN3 4URSN3 4USSN3 4UTSN3 4UUSN3 4UWSN3 4UXSN3 4UYSN3 4UZSN3 4WASN3 4WBSN3 4WDSN3 4WESN3 4WFSN3 4WHSN3 4WQSN3 4WTSN3 4WZSN3 4XASN3 4XBSN3 4XDSN3 4XESN3 4XFSN3 4XGSN3 4XHSN3 4XLSN3 4XNSN3 4XPSN3 4XQSN3 4XRSN3 4XSSN3 4XTSN3 4XUSN3 4XWSN3 4XXSN3 4XYSN3 4XZSN3 4YASN3 4YBSN3 4YDSN3 4YESN3 4YFSN3 4YHSN3 4YQSN3 4ZNSN3 4ZXSN3 4ZYSN3 4ZZ

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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