PO31 postcode district

Postcodes and sectors

468 of the district's 560 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 50.75530, -1.30744, which locates the district, not a building.

Companies registered in PO31

Companies House lists 883 companies with a registered office in PO31; 62 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 PO31

• Isle of Wight
• South East
• Cowes
• Rew Street
• Newport
• Great Thorness

Roads filed under PO31

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.

• Admiral Way
• Airfield Way
• Albert Road
• Albert Street
• Alexandra Road
• Arctic Road
• Arnold Road
• Ash Grove
• Ashton Terrace
• Baring Drive
• Baring Road
• Bars Hill
• Bath Road
• Battery Road
• Bay View Road
• Beckford Road
• Bellevue Road
• Bernard Road
• Birmingham Road
• Blackberry Lane
• Brambles Lane
• Bridge Road
• Broadfields Avenue
• Brooklands Road
• Brunswick Road
• Carvel Lane
• Castle Hill
• Castle Road
• Charles Road
• Chawton Lane
• Chessell Close
• Churchill Close
• Churchill Road
• Church Lane
• Church Road
• Church View Close
• Cliff Road
• Cockleton Lane
• Consort Road
• Cordelia Gardens
• Coronation Avenue
• Coronation Road
• Cotton Close
• Cow Lane
• Cranleigh Gardens
• Crossfield Avenue
• Cross Street
• Deauville Avenue
• Debourne Close
• Debourne Manor Drive
• Denmark Road
• Edinburgh Close
• Egypt Copse
• Egypt Esplanade
• Egypt Hill
• Elm Grove
• Ensign Close
• Enterprise Way
• Esplanade
• Fairlead Road

Check an address in PO31

Check an address in PO31

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=PO31" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about PO31

What does a PO31 postcode tell you?

That the address lies in the PO31 district of the PO (Portsmouth) postcode area, and the place OS Open Names most often lists first for its postcodes is Cowes. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 468 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 PO31

• PO321.9 km
• PO307.2 km
• PO3310.4 km
• PO1310.9 km
• PO1411.2 km
• SO4511.9 km
• PO1212.6 km
• SO3112.8 km
• PO4113.3 km
• PO1513.8 km
• PO3414.3 km
• PO3614.8 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids