SA4 postcode district

Postcodes and sectors

1,150 of the district's 2,133 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 51.67318, -4.04823, which locates the district, not a building.

Companies registered in SA4

Companies House lists 1,655 companies with a registered office in SA4; 63 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 SA4

• Wales
• Abertawe
• Swansea
• Gorseinon
• Pontarddulais
• Penllergaer
• Gowerton
• Tre-gwyr
• Casllwchwr
• Loughor
• Sir Gaerfyrddin
• Carmarthenshire
• Pen-clawdd
• Hendy
• Three Crosses
• Pontlliw
• Fforest
• Grovesend
• Tircoed
• Crofty
• Blue Anchor
• Llanmorlais
• Llanedi
• Wernffrwd

Roads filed under SA4

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.

• Abercedi
• Ael-y-Bryn
• Alder Way
• Alexandra Road
• Allt-Iago Road
• Allt-y-Graban Road
• Anchor Court
• Anton Court
• Argyll Avenue
• Arlan Gwilli
• Ash Grove
• Ashley Court
• Banc-yr-Eithin
• Banc Bach
• Banfield Terrace
• Baytree Court
• Beach Road
• Beauchamp Walk
• Beech Crescent
• Beili Glas
• Belgrave Close
• Belgrave Road
• Belle Vue
• Benson Road
• Benson Street
• Bethel Lane
• Birch Rock Road
• Bishwell Road
• Blackhill Road
• Blaencedi
• Blaenmorfa
• Blodwen Terrace
• Blue Anchor Road
• Bolgoed Road
• Borough Road
• Box Road
• Brighton Road
• Broadwood
• Bron Afon
• Bron Afon Uchaf
• Bronallt Road
• Brookfield Close
• Brookside
• Brownhills
• Brunant Road
• Bryn-Bach Road
• Bryn-y-Mor
• Bryn-y-Mor Road
• Brynafon Road
• Brynamlwg Road
• Brynawel Road
• Bryn Bach
• Bryncelyn Road
• Bryn Close
• Brynderi Close
• Bryneinon Road
• Bryn Eithin
• Bryneithin Road
• Brynffynnon Road
• Bryngolau

Check an address in SA4

Check an address in SA4

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SA4" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SA4

What does an SA4 postcode tell you?

That the address lies in the SA4 district of the SA (Swansea) postcode area, and the place OS Open Names most often lists first for its postcodes is Gorseinon. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 1,150 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 SA4

• SA56.0 km
• SA26.9 km
• SA148.0 km
• SA68.7 km
• SA158.8 km
• SA19.1 km
• SA310.2 km
• SA711.1 km
• SA1614.5 km
• SA814.8 km
• SA1815.1 km
• SA1017.2 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids