SO51 9 postcode sector in the SO51 district

SO51 9 is a sector of the SO51 district: every postcode that starts SO51 9. It has 64 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 SO51 9 sector, and which are new since 2020

Map of every postcode in the SO51 9 sector, by new since 2020 Of the 64 postcodes in the SO51 9 sector that ONS places, 4 are new since 2020 and 60 were in use before 2020. Places named: Romsey, North Baddesley. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. M27A3057 SO51 9AA: before 2020SO51 9AB: before 2020SO51 9AE: before 2020SO51 9AF: before 2020SO51 9AG: before 2020SO51 9AJ: before 2020SO51 9AL: before 2020SO51 9AN: before 2020SO51 9AP: before 2020SO51 9AQ: before 2020SO51 9AS: before 2020SO51 9AT: before 2020SO51 9AU: before 2020SO51 9AX: before 2020SO51 9BA: before 2020SO51 9BB: before 2020SO51 9BD: before 2020SO51 9BE: before 2020SO51 9BG: before 2020SO51 9BJ: before 2020SO51 9BL: before 2020SO51 9BN: before 2020SO51 9BP: before 2020SO51 9BQ: before 2020SO51 9BR: before 2020SO51 9BT: before 2020SO51 9BU: before 2020SO51 9BW: before 2020SO51 9BX: before 2020SO51 9BY: before 2020SO51 9BZ: before 2020SO51 9DA: before 2020SO51 9DB: before 2020SO51 9DD: before 2020SO51 9DE: before 2020SO51 9DF: before 2020SO51 9DG: before 2020SO51 9DH: before 2020SO51 9DJ: before 2020SO51 9DL: before 2020SO51 9DN: before 2020SO51 9DQ: before 2020SO51 9LA: before 2020SO51 9LB: before 2020SO51 9LE: before 2020SO51 9LF: before 2020SO51 9LG: before 2020SO51 9LH: before 2020SO51 9LL: before 2020SO51 9LN: before 2020SO51 9LP: before 2020SO51 9LQ: before 2020SO51 9NJ: before 2020SO51 9PA: before 2020SO51 9ZE: before 2020SO51 9ZF: before 2020SO51 9ZH: before 2020SO51 9AW: new since 2020SO51 9AY: new since 2020SO51 9LJ: new since 2020SO51 9ZD: new since 2020 RomseyNorth Baddesley Map of every postcode in the SO51 9 sector, by new since 2020 Of the 64 postcodes in the SO51 9 sector that ONS places, 4 are new since 2020 and 60 were in use before 2020. Places named: Romsey, North Baddesley. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 2 km. A27 RomseyNorth Baddesley
  • New since 2020: 4
  • In use before 2020: 60

Of the 64 postcodes in the SO51 9 sector that ONS places, 4 are new since 2020 and 60 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.

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 4 newest postcodes

SO51 9AYMay 2026SO51 9ZDJanuary 2023SO51 9LJJuly 2022SO51 9AWSeptember 2020

What do homes sell for in SO51 9?

Homes in SO51 9 sold for a typical £956,250 in the 12 months to August 2026, across 6 sales, up 6.3% on the 12 months before, HM Land Registry's figures show.

£956,250 typical price, the 12 months to August 2026
£900,000 12 months to August 2025
▲ up 6.3% on the 12 months before
  • Detached £956,250 6 sales

Standard sales of homes at market value at the postcodes that start SO51 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 SO51 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.

SO51 9AASO51 9ABSO51 9ADSO51 9AESO51 9AFSO51 9AGSO51 9AHSO51 9AJSO51 9ALSO51 9ANSO51 9APSO51 9AQSO51 9ASSO51 9ATSO51 9AUSO51 9AWSO51 9AXSO51 9AYSO51 9BASO51 9BBSO51 9BDSO51 9BESO51 9BGSO51 9BJSO51 9BLSO51 9BNSO51 9BPSO51 9BQSO51 9BRSO51 9BSSO51 9BTSO51 9BUSO51 9BWSO51 9BXSO51 9BYSO51 9BZSO51 9DASO51 9DBSO51 9DDSO51 9DESO51 9DFSO51 9DGSO51 9DHSO51 9DJSO51 9DLSO51 9DNSO51 9DQSO51 9LASO51 9LBSO51 9LESO51 9LFSO51 9LGSO51 9LHSO51 9LJSO51 9LLSO51 9LNSO51 9LPSO51 9LQSO51 9NJSO51 9PASO51 9ZDSO51 9ZESO51 9ZFSO51 9ZH

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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