SA20 postcode district

Postcodes and sectors

237 of the district's 269 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 52.01178, -3.78777, which locates the district, not a building.

Companies registered in SA20

Companies House lists 131 companies with a registered office in SA20; none of them at an address 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 SA20

• Sir Gaerfyrddin
• Carmarthenshire
• Wales
• Llanymddyfri
• Llandovery
• Myddfai
• Cynghordy
• Rhandirmwyn
• Cilycwm
• Nant-y-Bai
• Halfway
• Siloh
• Pentre-ty-gwyn
• Babel
• Pentrebach

Roads filed under SA20

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.

• Adelaide Street
• Argall Avenue
• Brecon Road
• Bridge Street
• Broad Street
• Bronhaul
• Castle Street
• Church Bank
• Cilycwm Road
• Clos Dingad
• Clos Pantycelyn
• Clos Pluguen
• College View
• Colwg y Coleg
• Dingat Close
• Dingat View
• Dolau Bran
• Fford y Frenhines
• Garden Lane
• Gasworks Lane
• Gelli Deg
• Golwg Llandingad
• Heol Beili-Glas
• Heol Cae-Du
• Heol Cerrig-man
• Heol Cilycwm
• Heol Gwernfelen
• Heol Llanfair
• Heol Newydd
• Heol Pluguffan
• Heol Rhos
• Heol Royston
• Heol Waunllystir
• Heol y Brenin
• High Street
• King's Road
• Llanfair Road
• Llys Llanfair
• Llys y Porthmyn
• Lon Gwaith Nwy
• Lon Rhys Pritchard
• Lon yr Ardd
• Lower Road
• Maes-y-Coleg
• Maesglas
• Market Square
• Market Street
• New Road
• Orchard Street
• Queen Street
• Queensway
• Rhiw Rhydings
• Rhiw Ydw
• Rhodfa Tywi
• School Lane
• Stone Street
• Stryd Fawr
• Stryd Lydan
• Stryd Serrig
• Stryd y Bont

Check an address in SA20

Check an address in SA20

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SA20" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SA20

What does an SA20 postcode tell you?

That the address lies in the SA20 district of the SA (Swansea) postcode area, and the place OS Open Names most often lists first for its postcodes is Sir Gaerfyrddin. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 237 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 SA20

• SA1912.7 km
• LD517.0 km
• LD419.7 km
• SA925.7 km
• SA1826.6 km
• SA4826.8 km
• SY2527.2 km
• SA4027.7 km
• LD329.2 km
• SA3229.6 km
• LD230.6 km
• SA3931.2 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids