SY18 6FD is located in the Llanidloes electoral ward, within the unitary authority of Powys and the Welsh Parliamentary constituency of Montgomeryshire. The Local Health Board is Powys Teaching and the police force is Dyfed-Powys. This postcode has been in use since September 2021.
| Easting | 296121 |
| Northing | 285010 |
| Latitude | 52.453148 |
| Longitude | -3.530074 |
| Country | Wales |
| Postcode District | SY18 |
| Ward | Llanidloes |
|---|---|
| Constituency | Montgomeryshire |
3, HAFREN CLOSE, LLANIDLOES, SY18 6FD 2021 3 SEP £240,000 |
| Army Cadet Centre (Victoria Avenue) | Llanidloes | 445m |
| Army Cadet Centre (Victoria Avenue) | Llanidloes | 448m |
| Hospital (Grounds) | Llanidloes | 616m |
| Post Office (Long Bridge Post Office) | Llanidloes | 771m |
| Red Lion Hotel (Long Bridge Street) | Llanidloes | 809m |


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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 SY18 6FD:
| ITL 1 Code | Name |
|---|---|
| TLL | Wales |
| ITL 2 Code | Name |
| TLL2 | East Wales |
| ITL 3 Code | Name |
| TLL24 | Powys |
| LAU 1 Code | Name |
| W06000023 | Powys |
The below table lists the Census Output Area (OA), Lower Layer Super Output Area (LSOA), and Middle Layer Super Output Area (MSOA) for SY18 6FD:
| Code | Name | |
|---|---|---|
| OA | W00002484 | |
| LSOA | W01000467 | Powys 010D |
| MSOA | W02000106 | Powys 010 |
| SY18 6AT | Hafren Terrace | 209m |
| SY18 6JQ | Parc Llwyn | 479m |
| SY18 6BA | Well Lane | 481m |
| SY18 6HP | Pen Y Borfa | 483m |
| SY18 6AS | Victoria Avenue | 543m |
| SY18 6HZ | Trefeglwys Road | 559m |
| SY18 6AZ | Idloes Terrace | 575m |
| SY18 6HY | 605m | |
| SY18 6JD | Cynon Cottages | 619m |
| SY18 6BB | Pengeulan | 645m |