PO3 postcode district

Postcodes and sectors

441 of the district's 587 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 50.81613, -1.05918, which locates the district, not a building.

Companies registered in PO3

Companies House lists 1,666 companies with a registered office in PO3; 129 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 PO3

• Portsmouth
• City of Portsmouth
• South East

Roads filed under PO3

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.

• Ackworth Road
• Adstone Lane
• Airport Service Road
• Airspeed Road
• Alchorne Place
• Algiers Road
• Allcot Road
• Alliance Way
• Althorpe Drive
• Anchorage Road
• Andrew Close
• Arras Road
• Ascot Road
• Aylen Road
• Baffins Road
• Bapaume Road
• Barton Grove
• Beasant Close
• Benham Drive
• Bilton Way
• Blakesley Lane
• Bolde Close
• Boughton Court
• Bowler Avenue
• Bowler Court
• Brampton Lane
• Breech Close
• Buckby Lane
• Burcote Drive
• Burrfields Road
• Cambrai Close
• Carronade Walk
• Catherington Place
• Cedar Grove
• Chasewater Avenue
• Cheslyn Road
• Chesterfield Road
• Chilcote Road
• Church Way
• Claybank Road
• Claybank Spur
• Cobden Avenue
• Colebrook Avenue
• Collis Road
• Coniston Avenue
• Cooper Road
• Copnor Road
• Corby Crescent
• Cotton Road
• Dartmouth Road
• Daventry Lane
• Devon Road
• Douglas Road
• Dover Road
• Dudley Road
• Dundas Close
• Dundas Lane
• Dundas Spur
• Eastbourne Road
• Eastern Road

Check an address in PO3

Check an address in PO3

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=PO3" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about PO3

What does a PO3 postcode tell you?

That the address lies in the PO3 district of the PO (Portsmouth) postcode area, and the place OS Open Names most often lists first for its postcodes is Portsmouth. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 441 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 PO3

• PO21.3 km
• PO12.8 km
• PO42.9 km
• PO63.5 km
• PO53.6 km
• PO126.1 km
• PO116.4 km
• PO97.4 km
• PO77.5 km
• PO168.0 km
• PO138.6 km
• PO1010.0 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids