SA42 postcode district
SA42, in the SA (Swansea) postcode area, has 156 live and 5 terminated postcodes in the ONS Postcode Directory of August 2026, and OS Open Names files 53 roads under it.
| postcode area | SA (Swansea) |
|---|---|
| live postcodes | 156 |
| terminated postcodes | 5 |
| sectors | 1 |
| roads listed | 53 |
| companies registered | 99 |
| centroid | 52.01546, -4.85309 |
| directory release | 2026-08 |
Postcodes and sectors
156 of the district's 161 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 52.01546, -4.85309, which locates the district, not a building.
| sector | live | terminated |
|---|---|---|
| SA42 0 | 156 | 5 |
Companies registered in SA42
Companies House lists 99 companies with a registered office in SA42 (1 October 2026 snapshot).
Places OS Open Names lists for SA42
- Sir Benfro
- Pembrokeshire
- Wales
- Trefdraeth
- Newport
- Dinas Cross
- Nanhyfer
- Nevern
- Cilgwyn
- Cwm-yr-Eglwys
- Gethsemane
Roads filed under SA42
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.
- Bridge Street
- Bromeddyg
- Cae Tabor
- Carreg Coetan
- Castle Street
- Church Street
- Cysgod y Dderwen
- East Street
- Feidr Bentick
- Feidr Brenin
- Feidr Cefn
- Feidre Cefn
- Feidr Eglwys
- Feidr Fawr
- Feidr Felin
- Feidr Fâch
- Feidr Ganol
- Feidr Pen-y-Bont
- Fford Cilgwyn
- Ffordd Bedd Morris
- Goat Street
- Iard y Parrog
- Llain yr Eglwys
- Lle Bryony
- Long Street
- Lon Las
- Lower St Mary's Street
- Maes Ingli
- Maes Morfa
- Maes y Cnwce
- Maes y Dderwen
- Maesyffynnon
- Maes y Mynydd
- Maes yr Eglwys
- Market Street
- Mill Lane
- Nell's Lane
- Parc Brynach
- Parc Nantwen
- Parc yr Eglwys
- Parc yr Onnen
- Parrog Road
- Rhiw Peter
- Spring Hill
- Sŵn y Nant
- The Paddocks
- Tir Treharn
- Upper Bridge Street
- Upper St Mary's Street
- Upper West Street
- West Street
- Yr Rhos
- A487
Check an address in SA42
The same road list through the API, from the outward code alone:
curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SA42" \ -H "Authorization: Bearer $SPAW_KEY"
Common questions about SA42
- What does an SA42 postcode tell you?
- That the address lies in the SA42 district of the SA (Swansea) postcode area, and the place OS Open Names most often lists first for its postcodes is Trefdraeth. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 156 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 SA42
- SA658.6 km
- SA4110.4 km
- SA6411.0 km
- SA6315.7 km
- SA6616.4 km
- SA4317.3 km
- SA3717.8 km
- SA3617.9 km
- SA6224.2 km
- SA3424.2 km
- SA6125.3 km
- SA3825.9 km
- Every district
- How a British address is written
- Check any address
distance between the districts' centroids
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