SO31 9 postcode sector in the SO31 district

SO31 9 is a sector of the SO31 district: every postcode that starts SO31 9. It has 194 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 SO31 9 sector, by flood risk

Map of every postcode in the SO31 9 sector, by flood risk Of the 194 postcodes in the SO31 9 sector that ONS places, 8 have a home or business at high risk, 1 are at medium risk at worst, 2 are at low risk at worst and 183 are not on the Environment Agency's at-risk list. 2 postcodes lie beyond the edge and are listed under the map. Places named: Locks Heath. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. SO31 9AA: not on the flood risk listSO31 9AB: not on the flood risk listSO31 9AD: not on the flood risk listSO31 9AE: not on the flood risk listSO31 9AF: not on the flood risk listSO31 9AG: not on the flood risk listSO31 9AH: not on the flood risk listSO31 9AJ: not on the flood risk listSO31 9AL: not on the flood risk listSO31 9AN: not on the flood risk listSO31 9AP: not on the flood risk listSO31 9AQ: not on the flood risk listSO31 9AR: not on the flood risk listSO31 9AS: not on the flood risk listSO31 9AT: not on the flood risk listSO31 9AU: not on the flood risk listSO31 9AW: not on the flood risk listSO31 9AX: not on the flood risk listSO31 9AY: not on the flood risk listSO31 9AZ: not on the flood risk listSO31 9BA: not on the flood risk listSO31 9BB: not on the flood risk listSO31 9BD: not on the flood risk listSO31 9BE: not on the flood risk listSO31 9BF: not on the flood risk listSO31 9BG: not on the flood risk listSO31 9BH: not on the flood risk listSO31 9BJ: not on the flood risk listSO31 9BL: not on the flood risk listSO31 9BN: not on the flood risk listSO31 9BP: not on the flood risk listSO31 9BQ: not on the flood risk listSO31 9BR: not on the flood risk listSO31 9BS: not on the flood risk listSO31 9BT: not on the flood risk listSO31 9BU: not on the flood risk listSO31 9BX: not on the flood risk listSO31 9BY: not on the flood risk listSO31 9BZ: not on the flood risk listSO31 9DA: not on the flood risk listSO31 9DB: not on the flood risk listSO31 9DE: not on the flood risk listSO31 9DW: not on the flood risk listSO31 9DX: not on the flood risk listSO31 9DY: not on the flood risk listSO31 9DZ: not on the flood risk listSO31 9EA: not on the flood risk listSO31 9EB: not on the flood risk listSO31 9ED: not on the flood risk listSO31 9EE: not on the flood risk listSO31 9EF: not on the flood risk listSO31 9EG: not on the flood risk listSO31 9EH: not on the flood risk listSO31 9EJ: not on the flood risk listSO31 9EL: not on the flood risk listSO31 9EN: not on the flood risk listSO31 9EQ: not on the flood risk listSO31 9ES: not on the flood risk listSO31 9ET: not on the flood risk listSO31 9EU: not on the flood risk listSO31 9EW: not on the flood risk listSO31 9EX: not on the flood risk listSO31 9EY: not on the flood risk listSO31 9EZ: not on the flood risk listSO31 9FB: not on the flood risk listSO31 9FD: not on the flood risk listSO31 9FE: not on the flood risk listSO31 9FF: not on the flood risk listSO31 9FG: not on the flood risk listSO31 9FH: not on the flood risk listSO31 9FJ: not on the flood risk listSO31 9FL: not on the flood risk listSO31 9FN: not on the flood risk listSO31 9FP: not on the flood risk listSO31 9FQ: not on the flood risk listSO31 9FU: not on the flood risk listSO31 9FW: not on the flood risk listSO31 9FX: not on the flood risk listSO31 9FY: not on the flood risk listSO31 9FZ: not on the flood risk listSO31 9GA: not on the flood risk listSO31 9GD: not on the flood risk listSO31 9GE: not on the flood risk listSO31 9GF: not on the flood risk listSO31 9GG: not on the flood risk listSO31 9GH: not on the flood risk listSO31 9GJ: not on the flood risk listSO31 9GL: not on the flood risk listSO31 9GN: not on the flood risk listSO31 9GP: not on the flood risk listSO31 9GQ: not on the flood risk listSO31 9GR: not on the flood risk listSO31 9GS: not on the flood risk listSO31 9GT: not on the flood risk listSO31 9GU: not on the flood risk listSO31 9GW: not on the flood risk listSO31 9GX: not on the flood risk listSO31 9GY: not on the flood risk listSO31 9GZ: not on the flood risk listSO31 9HA: not on the flood risk listSO31 9HB: not on the flood risk listSO31 9HD: not on the flood risk listSO31 9HE: not on the flood risk listSO31 9HH: not on the flood risk listSO31 9HL: not on the flood risk listSO31 9HN: not on the flood risk listSO31 9HP: not on the flood risk listSO31 9HQ: not on the flood risk listSO31 9HR: not on the flood risk listSO31 9HU: not on the flood risk listSO31 9HW: not on the flood risk listSO31 9HX: not on the flood risk listSO31 9HY: not on the flood risk listSO31 9HZ: not on the flood risk listSO31 9JA: not on the flood risk listSO31 9JB: not on the flood risk listSO31 9JD: not on the flood risk listSO31 9JE: not on the flood risk listSO31 9JF: not on the flood risk listSO31 9JG: not on the flood risk listSO31 9JH: not on the flood risk listSO31 9JJ: not on the flood risk listSO31 9JL: not on the flood risk listSO31 9JN: not on the flood risk listSO31 9JP: not on the flood risk listSO31 9JQ: not on the flood risk listSO31 9JR: not on the flood risk listSO31 9JS: not on the flood risk listSO31 9JT: not on the flood risk listSO31 9JU: not on the flood risk listSO31 9JW: not on the flood risk listSO31 9JX: not on the flood risk listSO31 9JY: not on the flood risk listSO31 9JZ: not on the flood risk listSO31 9LB: not on the flood risk listSO31 9LD: not on the flood risk listSO31 9LE: not on the flood risk listSO31 9LF: not on the flood risk listSO31 9LG: not on the flood risk listSO31 9LH: not on the flood risk listSO31 9LJ: not on the flood risk listSO31 9LL: not on the flood risk listSO31 9LN: not on the flood risk listSO31 9LP: not on the flood risk listSO31 9LQ: not on the flood risk listSO31 9LR: not on the flood risk listSO31 9LS: not on the flood risk listSO31 9LT: not on the flood risk listSO31 9LU: not on the flood risk listSO31 9LW: not on the flood risk listSO31 9LX: not on the flood risk listSO31 9LY: not on the flood risk listSO31 9LZ: not on the flood risk listSO31 9NA: not on the flood risk listSO31 9NB: not on the flood risk listSO31 9ND: not on the flood risk listSO31 9NE: not on the flood risk listSO31 9NF: not on the flood risk listSO31 9NS: not on the flood risk listSO31 9NT: not on the flood risk listSO31 9NU: not on the flood risk listSO31 9NW: not on the flood risk listSO31 9NX: not on the flood risk listSO31 9NY: not on the flood risk listSO31 9NZ: not on the flood risk listSO31 9PT: not on the flood risk listSO31 9PU: not on the flood risk listSO31 9PW: not on the flood risk listSO31 9RS: not on the flood risk listSO31 9RW: not on the flood risk listSO31 9RX: not on the flood risk listSO31 9RY: not on the flood risk listSO31 9RZ: not on the flood risk listSO31 9SA: not on the flood risk listSO31 9SB: not on the flood risk listSO31 9TA: not on the flood risk listSO31 9TB: not on the flood risk listSO31 9TH: not on the flood risk listSO31 9TP: not on the flood risk listSO31 9UH: not on the flood risk listSO31 9XQ: not on the flood risk listSO31 9HF: low flood risk at worstSO31 9HS: low flood risk at worstSO31 9HJ: medium flood risk at worstSO31 9FR: high flood riskSO31 9FS: high flood riskSO31 9FT: high flood riskSO31 9GB: high flood riskSO31 9HT: high flood riskSO31 9NL: high flood riskSO31 9TS: high flood riskSO31 9ZL: high flood risk Locks Heath Map of every postcode in the SO31 9 sector, by flood risk Of the 194 postcodes in the SO31 9 sector that ONS places, 8 have a home or business at high risk, 1 are at medium risk at worst, 2 are at low risk at worst and 183 are not on the Environment Agency's at-risk list. 2 postcodes lie beyond the edge and are listed under the map. Places named: Locks Heath. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Locks Heath
  • A home or business at high risk: 8
  • At medium risk at worst: 1
  • At low risk at worst: 2
  • At very low risk only: 0
  • Not on the at-risk list: 183

Of the 194 postcodes in the SO31 9 sector that ONS places, 8 have a home or business at high risk, 1 are at medium risk at worst, 2 are at low risk at worst and 183 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.

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.

SO31 9FR19 at high riskSO31 9ZL6 at high riskSO31 9FS4 at high riskSO31 9FT3 at high riskSO31 9GB3 at high riskSO31 9NL1 at high riskSO31 9HT1 at high riskSO31 9TS1 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.

SO31 9HGSO31 9LA

What do homes sell for in SO31 9?

Homes in SO31 9 sold for a typical £504,975 in the 12 months to August 2026, across 104 sales, up 12.2% on the 12 months before, HM Land Registry's figures show.

£504,975 typical price, the 12 months to August 2026
£450,000 12 months to August 2025
▲ up 12.2% on the 12 months before
  • Detached £612,500 62 sales
  • Semi-detached £405,000 21 sales
  • Terraced £335,000 11 sales
  • Flat or maisonette £208,000 10 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 9. 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 9

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 9AASO31 9ABSO31 9ADSO31 9AESO31 9AFSO31 9AGSO31 9AHSO31 9AJSO31 9ALSO31 9ANSO31 9APSO31 9AQSO31 9ARSO31 9ASSO31 9ATSO31 9AUSO31 9AWSO31 9AXSO31 9AYSO31 9AZSO31 9BASO31 9BBSO31 9BDSO31 9BESO31 9BFSO31 9BGSO31 9BHSO31 9BJSO31 9BLSO31 9BNSO31 9BPSO31 9BQSO31 9BRSO31 9BSSO31 9BTSO31 9BUSO31 9BXSO31 9BYSO31 9BZSO31 9DASO31 9DBSO31 9DESO31 9DWSO31 9DXSO31 9DYSO31 9DZSO31 9EASO31 9EBSO31 9EDSO31 9EESO31 9EFSO31 9EGSO31 9EHSO31 9EJSO31 9ELSO31 9ENSO31 9EQSO31 9ESSO31 9ETSO31 9EUSO31 9EWSO31 9EXSO31 9EYSO31 9EZSO31 9FBSO31 9FDSO31 9FESO31 9FFSO31 9FGSO31 9FHSO31 9FJSO31 9FLSO31 9FNSO31 9FPSO31 9FQSO31 9FRSO31 9FSSO31 9FTSO31 9FUSO31 9FWSO31 9FXSO31 9FYSO31 9FZSO31 9GASO31 9GBSO31 9GDSO31 9GESO31 9GFSO31 9GGSO31 9GHSO31 9GJSO31 9GLSO31 9GNSO31 9GPSO31 9GQSO31 9GRSO31 9GSSO31 9GTSO31 9GUSO31 9GWSO31 9GXSO31 9GYSO31 9GZSO31 9HASO31 9HBSO31 9HDSO31 9HESO31 9HFSO31 9HGSO31 9HHSO31 9HJSO31 9HLSO31 9HNSO31 9HPSO31 9HQSO31 9HRSO31 9HSSO31 9HTSO31 9HUSO31 9HWSO31 9HXSO31 9HYSO31 9HZSO31 9JASO31 9JBSO31 9JDSO31 9JESO31 9JFSO31 9JGSO31 9JHSO31 9JJSO31 9JLSO31 9JNSO31 9JPSO31 9JQSO31 9JRSO31 9JSSO31 9JTSO31 9JUSO31 9JWSO31 9JXSO31 9JYSO31 9JZSO31 9LASO31 9LBSO31 9LDSO31 9LESO31 9LFSO31 9LGSO31 9LHSO31 9LJSO31 9LLSO31 9LNSO31 9LPSO31 9LQSO31 9LRSO31 9LSSO31 9LTSO31 9LUSO31 9LWSO31 9LXSO31 9LYSO31 9LZSO31 9NASO31 9NBSO31 9NDSO31 9NESO31 9NFSO31 9NLSO31 9NSSO31 9NTSO31 9NUSO31 9NWSO31 9NXSO31 9NYSO31 9NZSO31 9PTSO31 9PUSO31 9PWSO31 9RSSO31 9RWSO31 9RXSO31 9RYSO31 9RZSO31 9SASO31 9SBSO31 9TASO31 9TBSO31 9THSO31 9TPSO31 9TSSO31 9UHSO31 9XQSO31 9ZL

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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