SA18 postcode district
SA18 holds 772 live postcodes around Ammanford, in Carmarthenshire, Neath Port Talbot, Swansea.
Towns and villages with their centre in SA18
| # | Place | County / council | Population |
|---|---|---|---|
| 1 | Ammanford | Carmarthenshire | 23,709 |
| 2 | Brynamman | Neath Port Talbot | 5,693 |
| 3 | Glanamman | Carmarthenshire | 4,168 |
| 4 | Llandybie | Carmarthenshire | 2,813 |
| 5 | Tycroes | Carmarthenshire | 2,156 |
Wards
| Name | Share of postcodes |
|---|---|
| Ammanford | 19% |
| Llandybie | 14% |
| Gwaun-Cae-Gurwen and Lower Brynamman | 13% |
| Saron | 10% |
| Betws | 9% |
| Garnant | 9% |
| Glanamman | 8% |
| Tycroes | 6% |
| Cwarter Bach | 6% |
| Pontarddulais | 2% |
And 3 more.
Westminster constituencies
| Name | Share of postcodes |
|---|---|
| Caerfyrddin | 78% |
| "Brecon | 13% |
| Llanelli | 6% |
| Gower | 2% |
Deprivation
The middle postcode here sits in decile 4 of the Welsh Index of Multiple Deprivation, Wales's own separate index, where decile 1 is the most deprived tenth of neighbourhoods and 10 the least. 40% of this district's postcodes sit in the most deprived three deciles, 10% in the least deprived three.
Deprivation deciles describe the LSOA neighbourhood each postcode sits in, weighted by postcodes rather than by people, because the postcode file carries no population. A district where the deprived neighbourhoods are densely populated will read better here than it would per resident.
Neighbouring districts in the SA area
SA1 · SA2 · SA3 · SA4 · SA5 · SA6 · SA7 · SA8 · SA9 · SA10 · SA11 · SA12 · SA13 · SA14 · SA15 · SA16 · SA17 · SA19 · SA20 · SA31 · SA32 · SA33 · SA34 · SA35 · SA36 · SA37 · SA38 · SA39 · SA40 · SA41 · SA42 · SA43 · SA44 · SA45 · SA46 · SA47 · SA48 · SA61 · SA62 · SA63 · SA64 · SA65 · SA66 · SA67 · SA68 · SA69 · SA70 · SA71 · SA72 · SA73 · SA80 · SA99
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v3.0. Postcode data is the ONS Postcode Directory, August 2026 edition; counts are live postcodes with a usable location. Northern Ireland postcodes carry a separate licence and are not included; Scotland joins when the site's Scottish coverage does.