SO18 1 postcode sector in the SO18 district

SO18 1 is a sector of the SO18 district: every postcode that starts SO18 1. It has 193 postcodes in use, 4 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 SO18 1 sector, by flood risk

Map of every postcode in the SO18 1 sector, by flood risk Of the 193 postcodes in the SO18 1 sector that ONS places, 20 have a home or business at high risk, 4 are at medium risk at worst, 10 are at low risk at worst and 159 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: Bitterne Park. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A335A3035A3024 SO18 1AE: not on the flood risk listSO18 1AF: not on the flood risk listSO18 1AG: not on the flood risk listSO18 1AH: not on the flood risk listSO18 1AJ: not on the flood risk listSO18 1AN: not on the flood risk listSO18 1AP: not on the flood risk listSO18 1AQ: not on the flood risk listSO18 1AR: not on the flood risk listSO18 1AS: not on the flood risk listSO18 1AT: not on the flood risk listSO18 1AU: not on the flood risk listSO18 1AZ: not on the flood risk listSO18 1BE: not on the flood risk listSO18 1BF: not on the flood risk listSO18 1BG: not on the flood risk listSO18 1BJ: not on the flood risk listSO18 1BL: not on the flood risk listSO18 1BN: not on the flood risk listSO18 1BP: not on the flood risk listSO18 1BQ: not on the flood risk listSO18 1BT: not on the flood risk listSO18 1BU: not on the flood risk listSO18 1BX: not on the flood risk listSO18 1DL: not on the flood risk listSO18 1DN: not on the flood risk listSO18 1DR: not on the flood risk listSO18 1DS: not on the flood risk listSO18 1DW: not on the flood risk listSO18 1DX: not on the flood risk listSO18 1DY: not on the flood risk listSO18 1DZ: not on the flood risk listSO18 1EE: not on the flood risk listSO18 1EF: not on the flood risk listSO18 1EH: not on the flood risk listSO18 1EJ: not on the flood risk listSO18 1EL: not on the flood risk listSO18 1EN: not on the flood risk listSO18 1EP: not on the flood risk listSO18 1EQ: not on the flood risk listSO18 1ES: not on the flood risk listSO18 1FG: not on the flood risk listSO18 1FP: not on the flood risk listSO18 1FQ: not on the flood risk listSO18 1FS: not on the flood risk listSO18 1FT: not on the flood risk listSO18 1FU: not on the flood risk listSO18 1FW: not on the flood risk listSO18 1FX: not on the flood risk listSO18 1FY: not on the flood risk listSO18 1FZ: not on the flood risk listSO18 1GA: not on the flood risk listSO18 1GF: not on the flood risk listSO18 1GG: not on the flood risk listSO18 1GJ: not on the flood risk listSO18 1GL: not on the flood risk listSO18 1GN: not on the flood risk listSO18 1GP: not on the flood risk listSO18 1GQ: not on the flood risk listSO18 1GR: not on the flood risk listSO18 1GS: not on the flood risk listSO18 1GU: not on the flood risk listSO18 1HA: not on the flood risk listSO18 1HG: not on the flood risk listSO18 1HH: not on the flood risk listSO18 1HJ: not on the flood risk listSO18 1HN: not on the flood risk listSO18 1HT: not on the flood risk listSO18 1HZ: not on the flood risk listSO18 1JA: not on the flood risk listSO18 1JB: not on the flood risk listSO18 1JD: not on the flood risk listSO18 1JE: not on the flood risk listSO18 1JF: not on the flood risk listSO18 1JG: not on the flood risk listSO18 1JH: not on the flood risk listSO18 1JJ: not on the flood risk listSO18 1JL: not on the flood risk listSO18 1JN: not on the flood risk listSO18 1JP: not on the flood risk listSO18 1JQ: not on the flood risk listSO18 1JR: not on the flood risk listSO18 1JS: not on the flood risk listSO18 1JT: not on the flood risk listSO18 1JW: not on the flood risk listSO18 1JX: not on the flood risk listSO18 1JY: not on the flood risk listSO18 1JZ: not on the flood risk listSO18 1LA: not on the flood risk listSO18 1LB: not on the flood risk listSO18 1LD: not on the flood risk listSO18 1LE: not on the flood risk listSO18 1LF: not on the flood risk listSO18 1LG: not on the flood risk listSO18 1LH: not on the flood risk listSO18 1LJ: not on the flood risk listSO18 1LL: not on the flood risk listSO18 1LN: not on the flood risk listSO18 1LP: not on the flood risk listSO18 1LQ: not on the flood risk listSO18 1LR: not on the flood risk listSO18 1LS: not on the flood risk listSO18 1LT: not on the flood risk listSO18 1LU: not on the flood risk listSO18 1LW: not on the flood risk listSO18 1LX: not on the flood risk listSO18 1LY: not on the flood risk listSO18 1LZ: not on the flood risk listSO18 1NA: not on the flood risk listSO18 1NB: not on the flood risk listSO18 1ND: not on the flood risk listSO18 1NE: not on the flood risk listSO18 1NF: not on the flood risk listSO18 1NG: not on the flood risk listSO18 1NH: not on the flood risk listSO18 1NJ: not on the flood risk listSO18 1NL: not on the flood risk listSO18 1NN: not on the flood risk listSO18 1NP: not on the flood risk listSO18 1NR: not on the flood risk listSO18 1NS: not on the flood risk listSO18 1NT: not on the flood risk listSO18 1NU: not on the flood risk listSO18 1NW: not on the flood risk listSO18 1NY: not on the flood risk listSO18 1NZ: not on the flood risk listSO18 1PA: not on the flood risk listSO18 1PB: not on the flood risk listSO18 1PD: not on the flood risk listSO18 1PE: not on the flood risk listSO18 1PF: not on the flood risk listSO18 1PG: not on the flood risk listSO18 1PH: not on the flood risk listSO18 1PJ: not on the flood risk listSO18 1PL: not on the flood risk listSO18 1PN: not on the flood risk listSO18 1PQ: not on the flood risk listSO18 1QA: not on the flood risk listSO18 1QB: not on the flood risk listSO18 1QD: not on the flood risk listSO18 1QP: not on the flood risk listSO18 1QQ: not on the flood risk listSO18 1QR: not on the flood risk listSO18 1QS: not on the flood risk listSO18 1QT: not on the flood risk listSO18 1QU: not on the flood risk listSO18 1QW: not on the flood risk listSO18 1QX: not on the flood risk listSO18 1QY: not on the flood risk listSO18 1RB: not on the flood risk listSO18 1RD: not on the flood risk listSO18 1TU: not on the flood risk listSO18 1TY: not on the flood risk listSO18 1UA: not on the flood risk listSO18 1UE: not on the flood risk listSO18 1UR: not on the flood risk listSO18 1AL: low flood risk at worstSO18 1AW: low flood risk at worstSO18 1BA: low flood risk at worstSO18 1BB: low flood risk at worstSO18 1BH: low flood risk at worstSO18 1GT: low flood risk at worstSO18 1DH: low flood risk at worstSO18 1GH: low flood risk at worstSO18 1HP: low flood risk at worstSO18 1UH: low flood risk at worstSO18 1BD: medium flood risk at worstSO18 1DU: medium flood risk at worstSO18 1EG: medium flood risk at worstSO18 1ER: medium flood risk at worstSO18 1AB: high flood riskSO18 1AD: high flood riskSO18 1AX: high flood riskSO18 1AY: high flood riskSO18 1BZ: high flood riskSO18 1DP: high flood riskSO18 1EA: high flood riskSO18 1GB: high flood riskSO18 1GD: high flood riskSO18 1GE: high flood riskSO18 1HL: high flood riskSO18 1NQ: high flood riskSO18 1NX: high flood riskSO18 1QN: high flood riskSO18 1UB: high flood riskSO18 1UD: high flood riskSO18 1UG: high flood riskSO18 1ZA: high flood risk Bitterne Park 6 postcodes at high or medium risk, outlined: this goes to SO18 1AY, the one with most homes and businesses at high risk6 postcodes at high or medium risk Map of every postcode in the SO18 1 sector, by flood risk Of the 193 postcodes in the SO18 1 sector that ONS places, 20 have a home or business at high risk, 4 are at medium risk at worst, 10 are at low risk at worst and 159 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: Bitterne Park. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A335 Bitterne Park
  • A home or business at high risk: 20
  • At medium risk at worst: 4
  • At low risk at worst: 10
  • At very low risk only: 0
  • Not on the at-risk list: 159
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 193 postcodes in the SO18 1 sector that ONS places, 20 have a home or business at high risk, 4 are at medium risk at worst, 10 are at low risk at worst and 159 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. 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; 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

20 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.

SO18 1HL21 at high riskSO18 1UB15 at high riskSO18 1AY10 at high riskSO18 1EA9 at high riskSO18 1EB9 at high riskSO18 1UG8 at high riskSO18 1ED6 at high riskSO18 1AD5 at high riskSO18 1GB5 at high riskSO18 1BZ3 at high riskSO18 1GE3 at high riskSO18 1ZA3 at high risk

Where the postcodes at high or medium risk lie together

  • 6 postcodes at high or medium risk, outlined on the map. SO18 1AY, is the one with most homes and businesses at high risk.

What do homes sell for in SO18 1?

Homes in SO18 1 sold for a typical £280,000 in the 12 months to August 2026, across 91 sales, up 1.3% on the 12 months before, HM Land Registry's figures show.

£280,000 typical price, the 12 months to August 2026
£276,500 12 months to August 2025
▲ up 1.3% on the 12 months before
  • Detached £380,000 19 sales
  • Semi-detached £350,000 31 sales
  • Terraced £279,250 6 sales
  • Flat or maisonette £140,000 35 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 SO18 1. 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 SO18 1

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.

SO18 1ABSO18 1ADSO18 1AESO18 1AFSO18 1AGSO18 1AHSO18 1AJSO18 1ALSO18 1ANSO18 1APSO18 1AQSO18 1ARSO18 1ASSO18 1ATSO18 1AUSO18 1AWSO18 1AXSO18 1AYSO18 1AZSO18 1BASO18 1BBSO18 1BDSO18 1BESO18 1BFSO18 1BGSO18 1BHSO18 1BJSO18 1BLSO18 1BNSO18 1BPSO18 1BQSO18 1BTSO18 1BUSO18 1BXSO18 1BZSO18 1DGSO18 1DHSO18 1DLSO18 1DNSO18 1DPSO18 1DRSO18 1DSSO18 1DUSO18 1DWSO18 1DXSO18 1DYSO18 1DZSO18 1EASO18 1EBSO18 1EDSO18 1EESO18 1EFSO18 1EGSO18 1EHSO18 1EJSO18 1ELSO18 1ENSO18 1EPSO18 1EQSO18 1ERSO18 1ESSO18 1FGSO18 1FPSO18 1FQSO18 1FSSO18 1FTSO18 1FUSO18 1FWSO18 1FXSO18 1FYSO18 1FZSO18 1GASO18 1GBSO18 1GDSO18 1GESO18 1GFSO18 1GGSO18 1GHSO18 1GJSO18 1GLSO18 1GNSO18 1GPSO18 1GQSO18 1GRSO18 1GSSO18 1GTSO18 1GUSO18 1HASO18 1HGSO18 1HHSO18 1HJSO18 1HLSO18 1HNSO18 1HPSO18 1HTSO18 1HZSO18 1JASO18 1JBSO18 1JDSO18 1JESO18 1JFSO18 1JGSO18 1JHSO18 1JJSO18 1JLSO18 1JNSO18 1JPSO18 1JQSO18 1JRSO18 1JSSO18 1JTSO18 1JWSO18 1JXSO18 1JYSO18 1JZSO18 1LASO18 1LBSO18 1LDSO18 1LESO18 1LFSO18 1LGSO18 1LHSO18 1LJSO18 1LLSO18 1LNSO18 1LPSO18 1LQSO18 1LRSO18 1LSSO18 1LTSO18 1LUSO18 1LWSO18 1LXSO18 1LYSO18 1LZSO18 1NASO18 1NBSO18 1NDSO18 1NESO18 1NFSO18 1NGSO18 1NHSO18 1NJSO18 1NLSO18 1NNSO18 1NPSO18 1NQSO18 1NRSO18 1NSSO18 1NTSO18 1NUSO18 1NWSO18 1NXSO18 1NYSO18 1NZSO18 1PASO18 1PBSO18 1PDSO18 1PESO18 1PFSO18 1PGSO18 1PHSO18 1PJSO18 1PLSO18 1PNSO18 1PQSO18 1QASO18 1QBSO18 1QDSO18 1QNSO18 1QPSO18 1QQSO18 1QRSO18 1QSSO18 1QTSO18 1QUSO18 1QWSO18 1QXSO18 1QYSO18 1RBSO18 1RDSO18 1RESO18 1TUSO18 1TYSO18 1UASO18 1UBSO18 1UDSO18 1UESO18 1UGSO18 1UHSO18 1URSO18 1WTSO18 1ZA

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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