SA18 3JG lies on Llandeilo Road Industrial Estate in Llandybie, Ammanford. SA18 3JG is located in the Llandybie electoral ward, within the unitary authority of Carmarthenshire and the Welsh Parliamentary constituency of Carmarthen East and Dinefwr. The Local Health Board is Hywel Dda University and the police force is Dyfed-Powys. This postcode has been in use since January 1980.


| Easting | 261919 |
| Northing | 216423 |
| Latitude | 51.829315 |
| Longitude | -4.005210 |
| Street | Llandeilo Road Industrial Estate |
| Locality | Llandybie |
| Town/City | Ammanford |
| Country | Wales |
| Postcode District | SA18 |
Elevation or altitude of SA18 3JG as distance above sea level:
| Metres | Feet | |
|---|---|---|
| Elevation | 70m | 230ft |
Elevation is measured from the approximate centre of the postcode, to the nearest point on an OS contour line from OS Terrain 50, which has contour spacing of ten vertical metres.
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| Ward | Llandybie |
|---|---|
| Constituency | Carmarthen East And Dinefwr |
UNIT 3, LLANDEILO ROAD INDUSTRIAL ESTATE, LLANDYBIE, AMMANFORD, SA18 3JG 1998 21 APR £15,000 |
| Pantrhodyn (Llandeilo Road) | Pentre-gwenlais | 166m |
| Pantrhodyn (Llandeilo Road) | Pentre-gwenlais | 176m |
| Morgans Junction (Un Named) | Pentre-gwenlais | 359m |
| Morgans Junction (Un Named) | Derwydd | 383m |
| Pentregwenlais Turn (Llandeilo Road) | Pentre-gwenlais | 468m |
| Llandybie Station | 0.9km |
| Ammanford Station | 3.8km |
| Ffairfach Station | 4.9km |



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| Last Collection | |||
|---|---|---|---|
| Location | Mon-Fri | Sat | Distance |
| Llandybie P O | 17:00 | 11:30 | 940m |
| Pentregwenlais | 16:30 | 10:45 | 1,015m |
| Pantllwyn | 16:15 | 10:30 | 1,407m |
The below table lists the International Territorial Level (ITL) codes (formerly Nomenclature of Territorial Units for Statistics (NUTS) codes) and Local Administrative Units (LAU) codes for SA18 3JG:
| ITL 1 Code | Name |
|---|---|
| TLL | Wales |
| ITL 2 Code | Name |
| TLL1 | West Wales and The Valleys |
| ITL 3 Code | Name |
| TLL14 | South West Wales |
| LAU 1 Code | Name |
| W06000010 | Carmarthenshire |
The below table lists the Census Output Area (OA), Lower Layer Super Output Area (LSOA), and Middle Layer Super Output Area (MSOA) for SA18 3JG:
| Code | Name | |
|---|---|---|
| OA | W00003658 | |
| LSOA | W01000681 | Carmarthenshire 011B |
| MSOA | W02000152 | Carmarthenshire 011 |
| SA18 3JF | Penpound Lane | 261m |
| SA18 3JD | Llandeilo Road | 421m |
| SA18 3JQ | Pentregwenlais Road | 525m |
| SA18 2TW | Kings Road | 672m |
| SA18 2TN | Kings Road | 684m |
| SA18 2TH | Caeffynnon Road | 694m |
| SA18 3JB | Llandeilo Road | 758m |
| SA18 2TL | Kings Road | 770m |
| SA18 3JA | Llandeilo Road | 831m |
| SA18 3HZ | Church Street | 938m |