SO23 postcode district

Postcodes and sectors

812 of the district's 1,620 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 51.06880, -1.30873, which locates the district, not a building.

Companies registered in SO23

Companies House lists 3,461 companies with a registered office in SO23; 1,743 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 SO23

• Winchester
• Hampshire
• South East
• Springvale
• Kings Worthy
• Headbourne Worthy
• Abbots Worthy

Roads filed under SO23

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.

• Abbey Hill Close
• Abbey Hill Road
• Abbey Passage
• Abbotts Close
• Abbotts Road
• Albion Place
• Alexandra Terrace
• Alresford Road
• Archery Lane
• Arthur Road
• Athelstan Road
• Austen Close
• Back Street
• Baigent Close
• Bar End Road
• Barfield Close
• Baring Road
• Barnes Close
• Beaufort Road
• Beaumond Green
• Bedfield Lane
• Bee Orchid Road
• Beggar's Lane
• Bentley Close
• Birinus Road
• Blackberry Field
• Black Swan Yard
• Blue Ball Hill
• Boxall Gardens
• Boyne Mead Road
• Boyne Rise
• Bridge Street
• Broadview Close
• Brooke Close
• Bull Drove
• Burnet Lane
• Busket Lane
• Campion Way
• Canon Street
• Canute Road
• Cassandra Road
• Castle Avenue
• Castle Rise
• Cathedral View
• Cavendish Grove
• Cedar Close
• Cedarwood
• Chalk Ridge
• Charles Close
• Chaundler Road
• Chesil Street
• Chesil Wood
• Chester Road
• Chestnut Mead
• Chilcomb Lane
• Christchurch Gardens
• Christchurch Road
• Church Green Close
• Churchill Close
• Church Lane

Check an address in SO23

Check an address in SO23

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SO23" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SO23

What does an SO23 postcode tell you?

That the address lies in the SO23 district of the SO (Southampton) postcode area, and the place OS Open Names most often lists first for its postcodes is Winchester. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 812 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 SO23

• SO210.9 km
• SO221.9 km
• SO5310.6 km
• SO5011.3 km
• SO2411.4 km
• SO5213.9 km
• SO3215.1 km
• SO2015.4 km
• SO5115.8 km
• SO1816.5 km
• SO3016.7 km
• SO1716.8 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids