What does an SA37 postcode tell you?

That the address lies in the SA37 district of the SA (Swansea) postcode area, and the place OS Open Names most often lists first for its postcodes is Sir Benfro. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 59 live postcodes.

SA37 postcode district

SA37, in the SA (Swansea) postcode area, has 59 live and 5 terminated postcodes in the ONS Postcode Directory of August 2026, and OS Open Names files 8 roads under it.

postcode area	SA (Swansea)
live postcodes	59
terminated postcodes	5
sectors	1
roads listed	8
companies registered	57
centroid	52.01590, -4.59334
directory release	2026-08

Postcodes and sectors

59 of the district's 64 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 52.01590, -4.59334, which locates the district, not a building.

sector	live	terminated
SA37 0	59	5

Companies registered in SA37

Companies House lists 57 companies with a registered office in SA37 (1 October 2026 snapshot).

Places OS Open Names lists for SA37

Wales
Sir Benfro
Pembrokeshire
Abercych
Boncath
Blaenffos
Sir Gaerfyrddin
Carmarthenshire
Capel Newydd
Newchapel

Roads filed under SA37

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.

Berllan Aur
Blaen Treweryll
Capel Colman Road
Clos-y-Gerddi
Cwrrt Dolwerdd
Erw-Wen
Llysonnen
B4332

Check an address in SA37

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SA37" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SA37

What does an SA37 postcode tell you?: That the address lies in the SA37 district of the SA (Swansea) postcode area, and the place OS Open Names most often lists first for its postcodes is Sir Benfro. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 59 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 SA37

SA366.5 km
SA418.0 km
SA438.3 km
SA388.4 km
SA4417.0 km
SA4217.8 km
SA6618.0 km
SA3418.3 km
SA3321.2 km
SA3923.9 km
SA6324.0 km
SA6526.0 km
Every district
How a British address is written
Check any address

distance between the districts' centroids

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