SO20 postcode district

Postcodes and sectors

346 of the district's 461 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 51.11645, -1.51630, which locates the district, not a building.

Companies registered in SO20

Companies House lists 630 companies with a registered office in SO20; 42 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 SO20

• Hampshire
• South East
• Test Valley
• King's Somborne
• Broughton
• Kentsboro
• Over Wallop
• Chilbolton
• Stockbridge
• Longstock
• Houghton
• Middle Wallop
• Nether Wallop
• Up Somborne
• Winchester
• Horsebridge
• Ashley
• North Houghton
• Furzedown
• Compton
• Little Somborne
• Newton Stacey
• Chilbolton Down
• Leckford

Roads filed under SO20

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.

• Alexander Close
• Appleton Close
• Aylwards Way
• Beech Avenue
• Beechcroft Cottages
• Beech Tree Walk
• Benham Drove
• Bent Street
• Birchen Coppice
• Birch Grove
• Branksome Avenue
• Branksome Close
• Brickkiln Drove
• Brock Mews
• Broughton Drove
• Broughton Road
• Buckholt Road
• Camp Field
• Chalk Hill
• Chalk Vale
• Chapel Close
• Chapel Lane
• Chestnut Place
• Chestnut Square
• Church Hill
• Church Lane
• Church Road
• Coley Lane
• Coolers Farm
• Cossaton Rise
• Cottage Road
• Court Lane
• Cow Drove Hill
• Craydown Lane
• Dennis's Lane
• Dixons Lane
• Downs Close
• Downs Road
• Drift Road
• Drove Hill
• Drove Road
• Ducks Lane
• Durnford Close
• Eagle Croft
• Eagle Dean
• Eastmans Field
• Eldon Close
• Eldon Road
• Evans Close
• Faithfulls Drove
• Falaise Road
• Farley Street
• Farriers Lane
• Five Acres Rise
• Five Bells Lane
• Forge Close
• Forthill Road
• Froghole Lane
• Furzedown Road
• Garston Mede

Check an address in SO20

Check an address in SO20

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SO20" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SO20

What does an SO20 postcode tell you?

That the address lies in the SO20 district of the SO (Southampton) postcode area, and the place OS Open Names most often lists first for its postcodes is Test Valley. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 346 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 SO20

• SP1010.8 km
• SP1112.4 km
• SO5113.4 km
• SO2213.8 km
• SO2114.7 km
• SO2315.4 km
• SO5216.3 km
• SP916.6 km
• SO5317.2 km
• RG2818.1 km
• SP418.3 km
• SP119.6 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids