SO17 3 postcode sector in the SO17 district

SO17 3 is a sector of the SO17 district: every postcode that starts SO17 3. It has 74 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 SO17 3 sector, and which are new since 2020

Map of every postcode in the SO17 3 sector, by new since 2020 Of the 74 postcodes in the SO17 3 sector that ONS places, 1 are new since 2020 and 73 were in use before 2020. One postcode lies beyond the edge and is listed under the map. Places named: Swaythling. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A335 SO17 3AA: before 2020SO17 3AB: before 2020SO17 3AD: before 2020SO17 3AE: before 2020SO17 3AF: before 2020SO17 3AG: before 2020SO17 3AH: before 2020SO17 3AJ: before 2020SO17 3AN: before 2020SO17 3AP: before 2020SO17 3AQ: before 2020SO17 3AR: before 2020SO17 3AS: before 2020SO17 3AT: before 2020SO17 3AU: before 2020SO17 3AW: before 2020SO17 3AX: before 2020SO17 3EA: before 2020SO17 3ED: before 2020SO17 3ES: before 2020SO17 3QY: before 2020SO17 3QZ: before 2020SO17 3RA: before 2020SO17 3RB: before 2020SO17 3RD: before 2020SO17 3RE: before 2020SO17 3RF: before 2020SO17 3RG: before 2020SO17 3RH: before 2020SO17 3RJ: before 2020SO17 3RL: before 2020SO17 3RN: before 2020SO17 3RP: before 2020SO17 3RQ: before 2020SO17 3RS: before 2020SO17 3RT: before 2020SO17 3RU: before 2020SO17 3RW: before 2020SO17 3RX: before 2020SO17 3RY: before 2020SO17 3RZ: before 2020SO17 3SA: before 2020SO17 3SB: before 2020SO17 3SD: before 2020SO17 3SE: before 2020SO17 3SF: before 2020SO17 3SG: before 2020SO17 3SH: before 2020SO17 3SJ: before 2020SO17 3SL: before 2020SO17 3SN: before 2020SO17 3SP: before 2020SO17 3SQ: before 2020SO17 3SS: before 2020SO17 3ST: before 2020SO17 3SU: before 2020SO17 3SW: before 2020SO17 3SX: before 2020SO17 3SY: before 2020SO17 3SZ: before 2020SO17 3TA: before 2020SO17 3TB: before 2020SO17 3TD: before 2020SO17 3TE: before 2020SO17 3TF: before 2020SO17 3TG: before 2020SO17 3TH: before 2020SO17 3TJ: before 2020SO17 3TL: before 2020SO17 3TN: before 2020SO17 3TW: before 2020SO17 3UA: before 2020SO17 3BD: new since 2020 Swaythling Map of every postcode in the SO17 3 sector, by new since 2020 Of the 74 postcodes in the SO17 3 sector that ONS places, 1 are new since 2020 and 73 were in use before 2020. One postcode lies beyond the edge and is listed under the map. Places named: Swaythling. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. Swaythling
  • New since 2020: 1
  • In use before 2020: 73

Of the 74 postcodes in the SO17 3 sector that ONS places, 1 are new since 2020 and 73 were in use before 2020.

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. New since 2020 means it came into use in January 2020 or later. 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; when each came into use: the same directory; 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 newest postcode

SO17 3BDSeptember 2021

Further out, not drawn

This postcode lies well apart from the rest, so the map is drawn without it to show the rest closer; it is in every count.

SO17 3WF

What do homes sell for in SO17 3?

Homes in SO17 3 sold for a typical £295,000 in the 12 months to August 2026, across 17 sales, down 3.9% on the 12 months before, HM Land Registry's figures show.

£295,000 typical price, the 12 months to August 2026
£307,000 12 months to August 2025
▼ down 3.9% on the 12 months before
  • Semi-detached £320,000 12 sales
  • Terraced 3 sales, too few to price
  • Flat or maisonette 2 sales, too few to price

Standard sales of homes at market value at the postcodes that start SO17 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 SO17 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.

SO17 3AASO17 3ABSO17 3ADSO17 3AESO17 3AFSO17 3AGSO17 3AHSO17 3AJSO17 3ANSO17 3APSO17 3AQSO17 3ARSO17 3ASSO17 3ATSO17 3AUSO17 3AWSO17 3AXSO17 3BDSO17 3EASO17 3EDSO17 3ESSO17 3QYSO17 3QZSO17 3RASO17 3RBSO17 3RDSO17 3RESO17 3RFSO17 3RGSO17 3RHSO17 3RJSO17 3RLSO17 3RNSO17 3RPSO17 3RQSO17 3RSSO17 3RTSO17 3RUSO17 3RWSO17 3RXSO17 3RYSO17 3RZSO17 3SASO17 3SBSO17 3SDSO17 3SESO17 3SFSO17 3SGSO17 3SHSO17 3SJSO17 3SLSO17 3SNSO17 3SPSO17 3SQSO17 3SSSO17 3STSO17 3SUSO17 3SWSO17 3SXSO17 3SYSO17 3SZSO17 3TASO17 3TBSO17 3TDSO17 3TESO17 3TFSO17 3TGSO17 3THSO17 3TJSO17 3TLSO17 3TNSO17 3TWSO17 3UASO17 3WF

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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