SO40 3 postcode sector in the SO40 district

SO40 3 is a sector of the SO40 district: every postcode that starts SO40 3. It has 222 postcodes in use, 12 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 SO40 3 sector, by flood risk

Map of every postcode in the SO40 3 sector, by flood risk Of the 222 postcodes in the SO40 3 sector that ONS places, 10 have a home or business at high risk, 22 are at low risk at worst, 2 are at very low risk only and 188 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. Places named: Totton. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A336 SO40 3AE: not on the flood risk listSO40 3AF: not on the flood risk listSO40 3AG: not on the flood risk listSO40 3AH: not on the flood risk listSO40 3AJ: not on the flood risk listSO40 3AL: not on the flood risk listSO40 3AN: not on the flood risk listSO40 3AP: not on the flood risk listSO40 3AQ: not on the flood risk listSO40 3AR: not on the flood risk listSO40 3AS: not on the flood risk listSO40 3AT: not on the flood risk listSO40 3AU: not on the flood risk listSO40 3AW: not on the flood risk listSO40 3AX: not on the flood risk listSO40 3AY: not on the flood risk listSO40 3AZ: not on the flood risk listSO40 3BA: not on the flood risk listSO40 3BB: not on the flood risk listSO40 3BD: not on the flood risk listSO40 3BE: not on the flood risk listSO40 3BG: not on the flood risk listSO40 3BH: not on the flood risk listSO40 3BJ: not on the flood risk listSO40 3BL: not on the flood risk listSO40 3BN: not on the flood risk listSO40 3BP: not on the flood risk listSO40 3BQ: not on the flood risk listSO40 3BR: not on the flood risk listSO40 3BS: not on the flood risk listSO40 3BT: not on the flood risk listSO40 3BU: not on the flood risk listSO40 3BW: not on the flood risk listSO40 3BX: not on the flood risk listSO40 3BY: not on the flood risk listSO40 3DB: not on the flood risk listSO40 3DE: not on the flood risk listSO40 3DF: not on the flood risk listSO40 3DH: not on the flood risk listSO40 3DJ: not on the flood risk listSO40 3DL: not on the flood risk listSO40 3DP: not on the flood risk listSO40 3DT: not on the flood risk listSO40 3DU: not on the flood risk listSO40 3DW: not on the flood risk listSO40 3FQ: not on the flood risk listSO40 3FR: not on the flood risk listSO40 3FS: not on the flood risk listSO40 3FT: not on the flood risk listSO40 3FU: not on the flood risk listSO40 3FW: not on the flood risk listSO40 3FX: not on the flood risk listSO40 3FY: not on the flood risk listSO40 3FZ: not on the flood risk listSO40 3GA: not on the flood risk listSO40 3GB: not on the flood risk listSO40 3GD: not on the flood risk listSO40 3GE: not on the flood risk listSO40 3GF: not on the flood risk listSO40 3GG: not on the flood risk listSO40 3GH: not on the flood risk listSO40 3GJ: not on the flood risk listSO40 3GL: not on the flood risk listSO40 3GN: not on the flood risk listSO40 3GP: not on the flood risk listSO40 3GQ: not on the flood risk listSO40 3GR: not on the flood risk listSO40 3GT: not on the flood risk listSO40 3GU: not on the flood risk listSO40 3GW: not on the flood risk listSO40 3GX: not on the flood risk listSO40 3GY: not on the flood risk listSO40 3GZ: not on the flood risk listSO40 3HA: not on the flood risk listSO40 3HB: not on the flood risk listSO40 3HD: not on the flood risk listSO40 3HG: not on the flood risk listSO40 3HH: not on the flood risk listSO40 3HJ: not on the flood risk listSO40 3HL: not on the flood risk listSO40 3HN: not on the flood risk listSO40 3HP: not on the flood risk listSO40 3HQ: not on the flood risk listSO40 3HR: not on the flood risk listSO40 3HS: not on the flood risk listSO40 3HW: not on the flood risk listSO40 3HX: not on the flood risk listSO40 3HY: not on the flood risk listSO40 3HZ: not on the flood risk listSO40 3JA: not on the flood risk listSO40 3JB: not on the flood risk listSO40 3JD: not on the flood risk listSO40 3JE: not on the flood risk listSO40 3JF: not on the flood risk listSO40 3JG: not on the flood risk listSO40 3JH: not on the flood risk listSO40 3JJ: not on the flood risk listSO40 3JL: not on the flood risk listSO40 3JN: not on the flood risk listSO40 3JP: not on the flood risk listSO40 3JQ: not on the flood risk listSO40 3JR: not on the flood risk listSO40 3JS: not on the flood risk listSO40 3JT: not on the flood risk listSO40 3JU: not on the flood risk listSO40 3JW: not on the flood risk listSO40 3JX: not on the flood risk listSO40 3JY: not on the flood risk listSO40 3LA: not on the flood risk listSO40 3LB: not on the flood risk listSO40 3LD: not on the flood risk listSO40 3LH: not on the flood risk listSO40 3LJ: not on the flood risk listSO40 3LL: not on the flood risk listSO40 3LN: not on the flood risk listSO40 3LP: not on the flood risk listSO40 3LQ: not on the flood risk listSO40 3LW: not on the flood risk listSO40 3LX: not on the flood risk listSO40 3LY: not on the flood risk listSO40 3LZ: not on the flood risk listSO40 3NA: not on the flood risk listSO40 3NB: not on the flood risk listSO40 3ND: not on the flood risk listSO40 3NF: not on the flood risk listSO40 3NG: not on the flood risk listSO40 3NH: not on the flood risk listSO40 3NJ: not on the flood risk listSO40 3NL: not on the flood risk listSO40 3NN: not on the flood risk listSO40 3NP: not on the flood risk listSO40 3NQ: not on the flood risk listSO40 3NS: not on the flood risk listSO40 3NW: not on the flood risk listSO40 3NX: not on the flood risk listSO40 3NY: not on the flood risk listSO40 3NZ: not on the flood risk listSO40 3PA: not on the flood risk listSO40 3PD: not on the flood risk listSO40 3PE: not on the flood risk listSO40 3PF: not on the flood risk listSO40 3PG: not on the flood risk listSO40 3PH: not on the flood risk listSO40 3PJ: not on the flood risk listSO40 3PN: not on the flood risk listSO40 3PX: not on the flood risk listSO40 3PY: not on the flood risk listSO40 3PZ: not on the flood risk listSO40 3QA: not on the flood risk listSO40 3QB: not on the flood risk listSO40 3QD: not on the flood risk listSO40 3QE: not on the flood risk listSO40 3QF: not on the flood risk listSO40 3QG: not on the flood risk listSO40 3QH: not on the flood risk listSO40 3QJ: not on the flood risk listSO40 3QL: not on the flood risk listSO40 3QN: not on the flood risk listSO40 3QP: not on the flood risk listSO40 3QQ: not on the flood risk listSO40 3QR: not on the flood risk listSO40 3QT: not on the flood risk listSO40 3QU: not on the flood risk listSO40 3RB: not on the flood risk listSO40 3RE: not on the flood risk listSO40 3RL: not on the flood risk listSO40 3RZ: not on the flood risk listSO40 3SA: not on the flood risk listSO40 3SG: not on the flood risk listSO40 3SH: not on the flood risk listSO40 3SJ: not on the flood risk listSO40 3SS: not on the flood risk listSO40 3SW: not on the flood risk listSO40 3SZ: not on the flood risk listSO40 3TH: not on the flood risk listSO40 3WW: not on the flood risk listSO40 3XE: not on the flood risk listSO40 3XJ: not on the flood risk listSO40 3YS: not on the flood risk listSO40 3ZA: not on the flood risk listSO40 3ZB: not on the flood risk listSO40 3ZE: not on the flood risk listSO40 3ZN: not on the flood risk listSO40 3ZP: not on the flood risk listSO40 3ZU: not on the flood risk listSO40 3ZW: not on the flood risk listSO40 3ZX: not on the flood risk listSO40 3AD: very low flood risk onlySO40 3JZ: very low flood risk onlySO40 3DG: low flood risk at worstSO40 3DN: low flood risk at worstSO40 3DR: low flood risk at worstSO40 3GS: low flood risk at worstSO40 3HE: low flood risk at worstSO40 3HF: low flood risk at worstSO40 3HT: low flood risk at worstSO40 3HU: low flood risk at worstSO40 3LE: low flood risk at worstSO40 3LF: low flood risk at worstSO40 3LG: low flood risk at worstSO40 3NR: low flood risk at worstSO40 3NT: low flood risk at worstSO40 3NU: low flood risk at worstSO40 3PP: low flood risk at worstSO40 3PQ: low flood risk at worstSO40 3PR: low flood risk at worstSO40 3PS: low flood risk at worstSO40 3PT: low flood risk at worstSO40 3PU: low flood risk at worstSO40 3PW: low flood risk at worstSO40 3WX: low flood risk at worstSO40 3AA: high flood riskSO40 3AB: high flood riskSO40 3LR: high flood riskSO40 3LS: high flood riskSO40 3LT: high flood riskSO40 3LU: high flood riskSO40 3NE: high flood riskSO40 3PB: high flood riskSO40 3PL: high flood riskSO40 3QS: high flood risk Totton 6 postcodes at high or medium risk, outlined: this goes to SO40 3LS, the one with most homes and businesses at high risk6 postcodes at high or medium risk Map of every postcode in the SO40 3 sector, by flood risk Of the 222 postcodes in the SO40 3 sector that ONS places, 10 have a home or business at high risk, 22 are at low risk at worst, 2 are at very low risk only and 188 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. Places named: Totton. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Totton 6 postcodes at high or medium risk, outlined: this goes to SO40 3LS, the one with most homes and businesses at high risk6 postcodes at high or medium risk
  • A home or business at high risk: 10
  • At medium risk at worst: 0
  • At low risk at worst: 22
  • At very low risk only: 2
  • Not on the at-risk list: 188
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 222 postcodes in the SO40 3 sector that ONS places, 10 have a home or business at high risk, 22 are at low risk at worst, 2 are at very low risk only and 188 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 150 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.

SO40 3LS18 at high riskSO40 3AA11 at high riskSO40 3AB10 at high riskSO40 3LU4 at high riskSO40 3NE3 at high riskSO40 3QS3 at high riskSO40 3LT2 at high riskSO40 3PB1 at high riskSO40 3LR1 at high riskSO40 3PL1 at high risk

Where the postcodes at high or medium risk lie together

  • 6 postcodes at high or medium risk, outlined on the map. SO40 3LS, is the one with most homes and businesses at high risk.

What do homes sell for in SO40 3?

Homes in SO40 3 sold for a typical £322,500 in the 12 months to August 2026, across 93 sales, up 0.2% on the 12 months before, HM Land Registry's figures show.

£322,500 typical price, the 12 months to August 2026
£322,000 12 months to August 2025
▲ up 0.2% on the 12 months before
  • Detached £378,000 28 sales
  • Semi-detached £340,000 33 sales
  • Terraced £280,000 11 sales
  • Flat or maisonette £165,000 21 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 SO40 3. 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 SO40 3

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.

SO40 3AASO40 3ABSO40 3ADSO40 3AESO40 3AFSO40 3AGSO40 3AHSO40 3AJSO40 3ALSO40 3ANSO40 3APSO40 3AQSO40 3ARSO40 3ASSO40 3ATSO40 3AUSO40 3AWSO40 3AXSO40 3AYSO40 3AZSO40 3BASO40 3BBSO40 3BDSO40 3BESO40 3BGSO40 3BHSO40 3BJSO40 3BLSO40 3BNSO40 3BPSO40 3BQSO40 3BRSO40 3BSSO40 3BTSO40 3BUSO40 3BWSO40 3BXSO40 3BYSO40 3DBSO40 3DESO40 3DFSO40 3DGSO40 3DHSO40 3DJSO40 3DLSO40 3DNSO40 3DPSO40 3DRSO40 3DTSO40 3DUSO40 3DWSO40 3FQSO40 3FRSO40 3FSSO40 3FTSO40 3FUSO40 3FWSO40 3FXSO40 3FYSO40 3FZSO40 3GASO40 3GBSO40 3GDSO40 3GESO40 3GFSO40 3GGSO40 3GHSO40 3GJSO40 3GLSO40 3GNSO40 3GPSO40 3GQSO40 3GRSO40 3GSSO40 3GTSO40 3GUSO40 3GWSO40 3GXSO40 3GYSO40 3GZSO40 3HASO40 3HBSO40 3HDSO40 3HESO40 3HFSO40 3HGSO40 3HHSO40 3HJSO40 3HLSO40 3HNSO40 3HPSO40 3HQSO40 3HRSO40 3HSSO40 3HTSO40 3HUSO40 3HWSO40 3HXSO40 3HYSO40 3HZSO40 3JASO40 3JBSO40 3JDSO40 3JESO40 3JFSO40 3JGSO40 3JHSO40 3JJSO40 3JLSO40 3JNSO40 3JPSO40 3JQSO40 3JRSO40 3JSSO40 3JTSO40 3JUSO40 3JWSO40 3JXSO40 3JYSO40 3JZSO40 3LASO40 3LBSO40 3LDSO40 3LESO40 3LFSO40 3LGSO40 3LHSO40 3LJSO40 3LLSO40 3LNSO40 3LPSO40 3LQSO40 3LRSO40 3LSSO40 3LTSO40 3LUSO40 3LWSO40 3LXSO40 3LYSO40 3LZSO40 3NASO40 3NBSO40 3NDSO40 3NESO40 3NFSO40 3NGSO40 3NHSO40 3NJSO40 3NLSO40 3NNSO40 3NPSO40 3NQSO40 3NRSO40 3NSSO40 3NTSO40 3NUSO40 3NWSO40 3NXSO40 3NYSO40 3NZSO40 3PASO40 3PBSO40 3PDSO40 3PESO40 3PFSO40 3PGSO40 3PHSO40 3PJSO40 3PLSO40 3PNSO40 3PPSO40 3PQSO40 3PRSO40 3PSSO40 3PTSO40 3PUSO40 3PWSO40 3PXSO40 3PYSO40 3PZSO40 3QASO40 3QBSO40 3QDSO40 3QESO40 3QFSO40 3QGSO40 3QHSO40 3QJSO40 3QLSO40 3QNSO40 3QPSO40 3QQSO40 3QRSO40 3QSSO40 3QTSO40 3QUSO40 3RBSO40 3RESO40 3RLSO40 3RSSO40 3RZSO40 3SASO40 3SGSO40 3SHSO40 3SJSO40 3SSSO40 3SWSO40 3SZSO40 3THSO40 3WWSO40 3WXSO40 3XESO40 3XJSO40 3YSSO40 3ZASO40 3ZBSO40 3ZESO40 3ZNSO40 3ZPSO40 3ZUSO40 3ZWSO40 3ZX

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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