SO51 postcode district

Postcodes and sectors

881 of the district's 1,373 postcodes are live in the ONS Postcode Directory of August 2026. A postcode directory says whether a code is in use, never who is there. The live postcodes centre on 50.99613, -1.50362, which locates the district, not a building.

Companies registered in SO51

Companies House lists 3,193 companies with a registered office in SO51; 625 of them at addresses shared by 25 or more companies (1 October 2026 snapshot). 25 is the count at which the address lookup reports a company cluster.

Places OS Open Names lists for SO51

• Hampshire
• South East
• Test Valley
• Romsey
• West Wellow
• Awbridge
• Lockerley
• East Wellow
• Braishfield
• Sherfield English
• New Forest
• Ampfield
• Michelmersh
• Broadgate
• Timsbury
• Abbotswood
• Crampmoor
• Shootash
• Mottisfont
• Winchester
• Dunbridge
• Belbins
• Wigley
• Canada

Roads filed under SO51

Named roads first, then numbered ones. A road is filed under one district even where it runs through several, so a street missing here may be listed under a neighbouring district — which is why the address lookup never calls a British street absent. Great Britain has no open register of buildings, so a listed road never means a building on it exists.

• Abbess Close
• Abbey Water
• Abbotswood Close
• Abbotts Drove
• Addison Close
• Albany Road
• Alder Close
• Allan Grove
• Alma Road
• Ambrose Way
• Anderson Close
• Anstey Road
• Anton Close
• Arun Way
• Ash Close
• Ashdown Way
• Ash Hill Lane
• Ashley Meadows
• Ashton Cross
• Avon Crescent
• Azure Drive
• Back Lane
• Baden Powell Way
• Banning Street
• Barnes Close
• Baroona Close
• Barton Close
• Battenberg Close
• Beech Close
• Belbins
• Bell Street
• Benedict Close
• Benger's Lane
• Beverley Gardens
• Birch Close
• Black Hill Road
• Blackthorn Close
• Botley Road
• Bottom Lane
• Bourne Close
• Braishfield Road
• Bramble Drive
• Branches Lane
• Bransley Close
• Brewery Lane
• Briar Way
• Brick Lane
• Brickwoods Close
• Bricky Lake Lane
• Bridge Road
• Broadgate Farm
• Broadwater Road
• Broad Woods Lane
• Brookfields
• Brook Way
• Budds Lane
• Bulls Drove
• Bunny Lane
• Burma Road
• Butlers Close

Check an address in SO51

Check an address in SO51

The same road list through the API, from the outward code alone:

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SO51" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SO51

What does an SO51 postcode tell you?

That the address lies in the SO51 district of the SO (Southampton) postcode area, and the place OS Open Names most often lists first for its postcodes is Romsey. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 881 live postcodes.

Where the counts come from

• ons-postcode-directory · version 2026-08 · Contains ONS, OS and Royal Mail data © Crown copyright and database right 2026, Open Government Licence v3.0. Northern Ireland postcodes are excluded: their reuse needs a Land & Property Services licence.
• os-open-names · version 2026-11-01 · Contains OS data © Crown copyright and database right 2026, Open Government Licence v3.0.
• uk-companies-house · version 2026-10-01 · Companies House free company data product, Open Government Licence v3.0

What each figure means, and what a district page never says, is set out in Reading a British postcode district page; the glossary defines a postcode district, a postcode area, a postcode directory and a street register.

Data synced on 2026-11-01: the newest version among the datasets listed above.

Districts nearest SO51

• SO524.7 km
• SO168.2 km
• SO538.5 km
• SO409.2 km
• SO1510.4 km
• SO1710.9 km
• SO5011.8 km
• SO1412.4 km
• SO1812.7 km
• SO2013.4 km
• SO4313.6 km
• SO2214.2 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids