These postcodes are structurally valid but fictional, for software testing and form design. This is not a Royal Mail postcode lookup: the Swansea districts are real, the full postcodes are not assigned to any address.
A random Swansea postcode generator combines a real Swansea postcode district with a generated inward code, producing a structurally valid postcode that is not assigned to any delivery point.
Every postcode on this page starts from a genuine Swansea postcode district. There are 6 of them, in the SA postcode area, and they all belong to the SWANSEA post town in West Glamorgan. The three characters after the space are generated to the Royal Mail format rules, so a result validates in any form or database while belonging to no real property.
SA3 3WQ — district SA3, sector SA3 3, SWANSEA, West GlamorganSA2 5ER — district SA2, sector SA2 5, SWANSEA, West GlamorganSA6 0ZX — district SA6, sector SA6 0, SWANSEA, West GlamorganSA3 1PA — district SA3, sector SA3 1, SWANSEA, West GlamorganSA7 0RB — district SA7, sector SA7 0, SWANSEA, West GlamorganSA3 2LQ — district SA3, sector SA3 2, SWANSEA, West GlamorganThis page produces postcodes on their own. For complete Swansea addresses — building number, street, locality, post town, West Glamorgan and postcode, laid out to Royal Mail conventions — use the random Swansea address generator.
A UK postcode splits into an outward code and an inward code. The outward code identifies the district; the inward code narrows it to a small group of properties. This generator keeps the first half real and generates the second, which is what makes the output safe to use and still valid.
Swansea sits in the SA postcode area. Every district below is a real outward code assigned to the SWANSEA post town.
| District | Locality | Structural range |
|---|---|---|
| SA1 | — | SA1 0AA – SA1 9ZZ |
| SA2 | Sketty | SA2 0AA – SA2 9ZZ |
| SA3 | Mumbles | SA3 0AA – SA3 9ZZ |
| SA5 | Fforestfach | SA5 0AA – SA5 9ZZ |
| SA6 | Morriston | SA6 0AA – SA6 9ZZ |
| SA7 | Llansamlet | SA7 0AA – SA7 9ZZ |
The structural range is what the postcode grammar permits for each district, not a list of codes Royal Mail has issued. Which sectors and units are actually allocated is Postcode Address File data, which is licensed and not held here — so a generated postcode inside the range may well be unallocated. For test data that is the point.
A postcode carries more than a location. Reading one from Swansea tells you which country's addressing conventions apply, which preserved county the address sits in, and — if you need a matching telephone number — which dialling code area it falls in.
| Field | Value | Where it comes from |
|---|---|---|
| Post town | SWANSEA | Royal Mail post town, written in capitals on the address |
| Postcode area | SA | The leading letters of every district above |
| Preserved county | West Glamorgan | ONS administrative geography |
| Country | Wales | One of the four countries of the United Kingdom |
| Region | Wales | The country name |
| Dialling code | 01792 | Ofcom National Telephone Numbering Plan |
Royal Mail has not required a county line on addressed mail since 1996. SWANSEA plus a correct postcode is sufficient; West Glamorgan is included because plenty of address forms and legacy databases still expect a county.
What they are not for: sending post, verifying an identity, or implying that a property exists. If you need to know whether a Swansea address is deliverable, that is a licensed Royal Mail Postcode Address File lookup, and no generator can answer it.
The districts are real: all 6 of them are Royal Mail outward codes genuinely assigned to the SWANSEA post town. The three characters after the space are generated, so the full postcode is almost certainly not allocated to any property. That combination is deliberate — the result resolves to Swansea in a district lookup and passes validation, but it is not a live delivery point and must never be used to send post.
6, in the SA postcode area: SA1, SA2, SA3, SA5, SA6, SA7. That is the count for the SWANSEA post town as recorded in this site's registry; a post town does not follow council boundaries, so it may not match what a resident would call "Swansea".
SA. The postcode area is the leading letter or letters of the outward code, so every Swansea postcode begins SA — for example SA1. The digits that follow identify the district within the area.
This page generates postcodes on their own and explains Swansea's district structure. The Swansea address generator produces complete postal addresses — building number, street, locality, post town, county and postcode — laid out to Royal Mail conventions. Use this page when you need postcodes to test a postcode field; use the address generator when you need whole addresses.
Yes, with no API key. Call GET /api/v1/postcodes/random?location=swansea&count=25 for JSON. Add &seed=1 to get the same set back on every request, which keeps snapshot tests stable. The response carries the outward code, inward code, area, district and sector for each postcode alongside the post town and county.
Structural validation, yes: the format, the length and the excluded letters are all respected, so a correctly written regex or a library check will accept them. A validator backed by licensed Postcode Address File data will reject most of them, correctly, because the full postcode is not an allocated delivery point. If your test suite needs addresses that pass a PAF lookup, no generator can supply them.
Postcodes are generated on demand and never stored. They are for software testing and development only, and must not be used to send post, to imply a real address, or for identity verification.