SO31 4 postcode sector in the SO31 district

SO31 4 is a sector of the SO31 district: every postcode that starts SO31 4. It has 120 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 SO31 4 sector, by flood risk

Map of every postcode in the SO31 4 sector, by flood risk Of the 120 postcodes in the SO31 4 sector that ONS places, 14 have a home or business at high risk, 1 are at medium risk at worst, 2 are at very low risk only and 103 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 9 postcodes at high or medium risk. Places named: Hamble-le-Rice. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. SO31 4BG: not on the flood risk listSO31 4BH: not on the flood risk listSO31 4BL: not on the flood risk listSO31 4BN: not on the flood risk listSO31 4BR: not on the flood risk listSO31 4BS: not on the flood risk listSO31 4BT: not on the flood risk listSO31 4BU: not on the flood risk listSO31 4FD: not on the flood risk listSO31 4FJ: not on the flood risk listSO31 4GB: not on the flood risk listSO31 4HE: not on the flood risk listSO31 4HF: not on the flood risk listSO31 4HH: not on the flood risk listSO31 4HJ: not on the flood risk listSO31 4HN: not on the flood risk listSO31 4HP: not on the flood risk listSO31 4HS: not on the flood risk listSO31 4HT: not on the flood risk listSO31 4HU: not on the flood risk listSO31 4HW: not on the flood risk listSO31 4HX: not on the flood risk listSO31 4HY: not on the flood risk listSO31 4HZ: not on the flood risk listSO31 4JA: not on the flood risk listSO31 4JE: not on the flood risk listSO31 4JF: not on the flood risk listSO31 4JG: not on the flood risk listSO31 4JH: not on the flood risk listSO31 4JJ: not on the flood risk listSO31 4JL: not on the flood risk listSO31 4JN: not on the flood risk listSO31 4JP: not on the flood risk listSO31 4JQ: not on the flood risk listSO31 4JR: not on the flood risk listSO31 4JS: not on the flood risk listSO31 4JT: not on the flood risk listSO31 4JU: not on the flood risk listSO31 4JW: not on the flood risk listSO31 4JX: not on the flood risk listSO31 4JY: not on the flood risk listSO31 4LA: not on the flood risk listSO31 4LB: not on the flood risk listSO31 4LD: not on the flood risk listSO31 4LE: not on the flood risk listSO31 4LF: not on the flood risk listSO31 4LG: not on the flood risk listSO31 4LH: not on the flood risk listSO31 4LJ: not on the flood risk listSO31 4LL: not on the flood risk listSO31 4LN: not on the flood risk listSO31 4LP: not on the flood risk listSO31 4LQ: not on the flood risk listSO31 4LR: not on the flood risk listSO31 4LS: not on the flood risk listSO31 4LT: not on the flood risk listSO31 4LU: not on the flood risk listSO31 4LW: not on the flood risk listSO31 4LX: not on the flood risk listSO31 4LY: not on the flood risk listSO31 4LZ: not on the flood risk listSO31 4ND: not on the flood risk listSO31 4NE: not on the flood risk listSO31 4NF: not on the flood risk listSO31 4NL: not on the flood risk listSO31 4NQ: not on the flood risk listSO31 4NR: not on the flood risk listSO31 4NZ: not on the flood risk listSO31 4PA: not on the flood risk listSO31 4PB: not on the flood risk listSO31 4PD: not on the flood risk listSO31 4PE: not on the flood risk listSO31 4PF: not on the flood risk listSO31 4PH: not on the flood risk listSO31 4QA: not on the flood risk listSO31 4QB: not on the flood risk listSO31 4QE: not on the flood risk listSO31 4QF: not on the flood risk listSO31 4QG: not on the flood risk listSO31 4QH: not on the flood risk listSO31 4QJ: not on the flood risk listSO31 4QP: not on the flood risk listSO31 4QU: not on the flood risk listSO31 4QZ: not on the flood risk listSO31 4RB: not on the flood risk listSO31 4RD: not on the flood risk listSO31 4RE: not on the flood risk listSO31 4RF: not on the flood risk listSO31 4RG: not on the flood risk listSO31 4RH: not on the flood risk listSO31 4RJ: not on the flood risk listSO31 4RN: not on the flood risk listSO31 4RP: not on the flood risk listSO31 4RQ: not on the flood risk listSO31 4RR: not on the flood risk listSO31 4RT: not on the flood risk listSO31 4RU: not on the flood risk listSO31 4RW: not on the flood risk listSO31 4RX: not on the flood risk listSO31 4RY: not on the flood risk listSO31 4RZ: not on the flood risk listSO31 4TS: not on the flood risk listSO31 4YA: not on the flood risk listSO31 4NA: very low flood risk onlySO31 4NN: very low flood risk onlySO31 4PJ: medium flood risk at worstSO31 4BQ: high flood riskSO31 4HA: high flood riskSO31 4HB: high flood riskSO31 4HD: high flood riskSO31 4HG: high flood riskSO31 4HL: high flood riskSO31 4HQ: high flood riskSO31 4HR: high flood riskSO31 4JB: high flood riskSO31 4JD: high flood riskSO31 4NB: high flood riskSO31 4PL: high flood riskSO31 4QD: high flood riskSO31 4RA: high flood risk Hamble-le-Rice 9 postcodes at high or medium risk, outlined: this goes to SO31 4JB, the one with most homes and businesses at high risk9 postcodes at high or medium risk Map of every postcode in the SO31 4 sector, by flood risk Of the 120 postcodes in the SO31 4 sector that ONS places, 14 have a home or business at high risk, 1 are at medium risk at worst, 2 are at very low risk only and 103 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 9 postcodes at high or medium risk. Places named: Hamble-le-Rice. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Hamble-le-Rice
  • A home or business at high risk: 14
  • At medium risk at worst: 1
  • At low risk at worst: 0
  • At very low risk only: 2
  • Not on the at-risk list: 103
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 120 postcodes in the SO31 4 sector that ONS places, 14 have a home or business at high risk, 1 are at medium risk at worst, 2 are at very low risk only and 103 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 170 metres of each other. It is not a boundary, and no boundary is drawn.

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

14 postcodes here have a home or business at high risk. These are the 12 with the most homes and businesses at that risk.

Beside each: how many of its homes and businesses the Environment Agency puts at that risk.

SO31 4JD67 at high riskSO31 4NB24 at high riskSO31 4JB8 at high riskSO31 4HQ6 at high riskSO31 4PL6 at high riskSO31 4HG5 at high riskSO31 4QD4 at high riskSO31 4HB3 at high riskSO31 4BQ2 at high riskSO31 4HA2 at high riskSO31 4HD2 at high riskSO31 4HL2 at high risk

Where the postcodes at high or medium risk lie together

  • 9 postcodes at high or medium risk, outlined on the map. SO31 4JB, is the one with most homes and businesses at high risk.

What do homes sell for in SO31 4?

Homes in SO31 4 sold for a typical £325,000 in the 12 months to August 2026, across 51 sales, down 7.1% on the 12 months before, HM Land Registry's figures show.

£325,000 typical price, the 12 months to August 2026
£350,000 12 months to August 2025
▼ down 7.1% on the 12 months before
  • Detached £502,500 13 sales
  • Semi-detached £387,000 11 sales
  • Terraced £295,000 12 sales
  • Flat or maisonette £187,500 15 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 SO31 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 SO31 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.

SO31 4BGSO31 4BHSO31 4BLSO31 4BNSO31 4BQSO31 4BRSO31 4BSSO31 4BTSO31 4BUSO31 4FDSO31 4FJSO31 4GBSO31 4HASO31 4HBSO31 4HDSO31 4HESO31 4HFSO31 4HGSO31 4HHSO31 4HJSO31 4HLSO31 4HNSO31 4HPSO31 4HQSO31 4HRSO31 4HSSO31 4HTSO31 4HUSO31 4HWSO31 4HXSO31 4HYSO31 4HZSO31 4JASO31 4JBSO31 4JDSO31 4JESO31 4JFSO31 4JGSO31 4JHSO31 4JJSO31 4JLSO31 4JNSO31 4JPSO31 4JQSO31 4JRSO31 4JSSO31 4JTSO31 4JUSO31 4JWSO31 4JXSO31 4JYSO31 4LASO31 4LBSO31 4LDSO31 4LESO31 4LFSO31 4LGSO31 4LHSO31 4LJSO31 4LLSO31 4LNSO31 4LPSO31 4LQSO31 4LRSO31 4LSSO31 4LTSO31 4LUSO31 4LWSO31 4LXSO31 4LYSO31 4LZSO31 4NASO31 4NBSO31 4NDSO31 4NESO31 4NFSO31 4NLSO31 4NNSO31 4NQSO31 4NRSO31 4NZSO31 4PASO31 4PBSO31 4PDSO31 4PESO31 4PFSO31 4PHSO31 4PJSO31 4PLSO31 4QASO31 4QBSO31 4QDSO31 4QESO31 4QFSO31 4QGSO31 4QHSO31 4QJSO31 4QPSO31 4QUSO31 4QZSO31 4RASO31 4RBSO31 4RDSO31 4RESO31 4RFSO31 4RGSO31 4RHSO31 4RJSO31 4RNSO31 4RPSO31 4RQSO31 4RRSO31 4RTSO31 4RUSO31 4RWSO31 4RXSO31 4RYSO31 4RZSO31 4TSSO31 4YA

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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