| Postcode | SA33 5EH | 
|---|---|
| Post Town | Carmarthen | 
| Nearest station | Carmarthen (6 km) | 
| Bus stops | No nearby bus stops | 
| Number of UPRNs | 20 View | 
| Known addresses | Briallu Gwyllt, Llysonnen Road, Carmarthen Bryn Siriol, Llysonnen Road, Carmarthen The Lonnen, Llysonnen Road, Carmarthen | 
| Main property type | Detached | 
| Businesses | 
| Latitude | 51.864783 | |
|---|---|---|
| Longitude | -4.389189 | |
| Easting | 235590 | |
| Northing | 221166 | |
| Grid reference | SN355211 | |
| UTM reference | 30U 404346 5746911 | |
| what3words | unclaimed.umbrellas.tribal | |
| FixPhrase | crisped luminous squatter urethane | |
| Plus code | 9C3QVJ76+W8 | |
| Altitude | 119 metres (390 feet) | |
| Sunrise (today) | 7:11 | |
| Sunset (today) | 16:53 | |
| Distance away | ||
| Distance to sea | 7.2 KMs (4.5 miles) | 
| Parish | Newchurch and Merthyr | W04000550 | 
|---|---|---|
| Ward | Trelech | W05001223 | 
| Unitary Authority | Carmarthenshire | W06000010 | 
| County | Dyfed | W11000002 | 
| Constituency (2024) | Caerfyrddin | W07000087 | 
| MP | Ms Ann Davies | Plaid Cymru | 
| Police force | Dyfed-Powys | |
| Water company | Dwr Cymru Welsh Water | |
| NUTS/ITL 3 | South West Wales | |
| NUTS/ITL 2 | Mid and South West Wales | |
| NUTS/ITL 1 | Wales | |
| Country | Wales | W92000004 | 
| Date introduced | January 1980 | 
|---|---|
| Last updated | September 2025 | 
| User type | Small (addresses receive less than 25 items of mail per day) | 
| Quality | Within the building of the matched address closest to the postcode mean | 
| Population (2011) | 23 | |
|---|---|---|
| Households (2011) | 9 | |
| Index of Multiple Deprivation (2019) | Most deprivedLeast deprived | |
| Average household income (2020) | Lowest (£22,200)
                        Highest (£108,100)
                       | |
| Rural/urban (2021) | Smaller rural: Further from a major town or city | |
| Rural/urban (2011) | Rural hamlet and isolated dwellings in a sparse setting | |
| Census output area (2021) | W00003490 | |
| Census output area (2011) | 1A3 | |
| Lower layer super output area (2021) | Carmarthenshire 006E | W01000649 | 
| Lower layer super output area (2011) | Carmarthenshire 006E | W01000649 | 
| Middle layer super output area (2021) | Carmarthen West & Cynwyl Elfed | W02000147 | 
| Middle layer super output area (2011) | Carmarthen West & Cynwyl Elfed | W02000147 | 
| Travel to work area | Llanelli | W22000028 | 
| Average property price in Swansea | £199,131 | 
|---|---|
| Annual change | 2.4% | 
| Address | Type | Date | Price | 
|---|---|---|---|
| Briallu Gwyllt, Llysonnen Road, Carmarthen | Detached (freehold) | Jun 2022 | £465,000 | 
| Detached (freehold) | Dec 2002 | £170,000 | |
| Detached (freehold) | Dec 1997 | £50,000 | |
| The Lonnen, Llysonnen Road, Carmarthen | Detached (freehold) | Jun 2020 | £525,000 | 
| Bryn Siriol, Llysonnen Road, Carmarthen | Other (freehold) | Aug 2018 | £20,000 |