SO45 postcode district

Postcodes and sectors

973 of the district's 1,294 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 50.84688, -1.39483, which locates the district, not a building.

Companies registered in SO45

Companies House lists 1,189 companies with a registered office in SO45; 32 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 SO45

• New Forest
• Hampshire
• South East
• Hythe
• Dibden Purlieu
• Holbury
• Blackfield
• Dibden
• Hardley
• Langley
• Fawley
• Little Holbury
• Calshot
• Hillhead
• Applemore
• Exbury
• Ower
• Sprat's Down
• Lepe
• Gilbury Hard
• Ashlett
• Stonehills
• Stone
• Roughdown

Roads filed under SO45

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.

• 1st Street
• 2nd Street
• 3rd Street
• 4th Street
• 5th Street
• 6th Street
• 7th Street
• 8th Street
• 9th Street
• 10th Street
• 11th Street
• 12th Street
• 13th Street
• 14th Street
• A Avenue
• Abbey Close
• Adams Road
• Admirals Close
• Admirals Way
• Agitator Road
• Albany Road
• Alder Close
• Alexandra Close
• Alexandra Road
• Alum Close
• Amberslade Walk
• Andrew Close
• April Gardens
• Armada Drive
• Armitage Avenue
• Arnwood Avenue
• Ashburton Close
• Ash Close
• Ashdown
• Ashdown Road
• Ashford Crescent
• Ashleigh Close
• Ashlett Close
• Ashlett Mews
• Ashlett Road
• Ashleycross Close
• Astra Court
• Atheling Road
• Avenue C
• Avenue D
• Avenue E
• Badgers Walk
• Badminston Drove
• Badminston Lane
• Barclay Mews
• B Avenue
• Beaulieu Road
• Beaumaris Gardens
• Beech Crescent
• Beechwood Road
• Beechwood Way
• Bell Close
• Belmont Close
• Belvedere Road
• Bennett Walk

Check an address in SO45

Check an address in SO45

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SO45" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SO45

What does an SO45 postcode tell you?

That the address lies in the SO45 district of the SO (Southampton) postcode area, and the place OS Open Names most often lists first for its postcodes is Hythe. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 973 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 SO45

• SO146.7 km
• SO196.7 km
• SO317.1 km
• SO158.1 km
• SO188.9 km
• SO178.9 km
• SO3010.3 km
• SO1610.4 km
• SO4210.6 km
• SO4010.6 km
• PO1511.9 km
• PO3111.9 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids