SA18 postcode district

Postcodes and sectors

772 of the district's 928 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 51.79780, -3.96090, which locates the district, not a building.

Companies registered in SA18

Companies House lists 1,176 companies with a registered office in SA18; 30 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 SA18

• Wales
• Sir Gaerfyrddin
• Carmarthenshire
• Ammanford
• Rhydaman
• Castell-nedd Port Talbot
• Neath Port Talbot
• Llandybie
• Brynamman
• Glanaman
• Gwaun-Cae-Gurwen
• Garnant
• Tycroes
• Capel Hendre
• Cwmgors
• Saron
• Penybanc
• Abertawe
• Swansea
• Tairgwaith
• Coopers
• Rhosaman
• Milo
• Derwydd

Roads filed under SA18

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.

• Aberlash Road
• Abernant Road
• Ammanford Road
• Amman Road
• Arcade Terrace
• Ardwyn Road
• Arfryn
• Argoed Road
• Arthur Street
• Ash Grove
• Banc y Ddraenen
• Banwen Place
• Baptist Lane
• Barry Road
• Betws Road
• Bishop Road
• Black Lion Road
• Blaenau Road
• Bonllwyn
• Bonllwyn Road
• Brodawel
• Bro Nant Fer
• Brook Terrace
• Bro Ryan
• Bro Walker
• Bryn-Lloi Road
• Bryn-Teg Terrace
• Brynamman Road
• Bryn Avenue
• Brynbach
• Bryncethin Road
• Brynceunant
• Brynderi
• Brynderwen Road
• Bryn Dreinog
• Bryneuraidd
• Brynhafod
• Brynmawr Avenue
• Brynmawr Crescent
• Brynmawr Lane
• Bryn Road
• Brynteg
• Caecoed
• Caeffynnon Road
• Cae Graynor
• Caemawr
• Caer Bryn Road
• Caer Groes
• Campbell Road
• Cannon Street
• Carregaman
• Carregaman Isaf
• Carregamman Lane
• Cefncrug
• Cefn Road
• Ceidrim Road
• Cemetery Road
• Chapel Street
• Church Lane
• Church Row

Check an address in SA18

Check an address in SA18

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SA18" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SA18

What does an SA18 postcode tell you?

That the address lies in the SA18 district of the SA (Swansea) postcode area, and the place OS Open Names most often lists first for its postcodes is Ammanford. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 772 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 SA18

• SA811.5 km
• SA1412.2 km
• SA913.3 km
• SA613.8 km
• SA415.1 km
• SA715.6 km
• SA1016.5 km
• SA516.6 km
• SA1917.5 km
• SA3217.5 km
• SA1517.9 km
• SA119.1 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids