| Postcode | LD3 8RB | 
|---|---|
| Post Town | Brecon | 
| Nearest station | Llandovery (14 km) | 
| Bus stops | 
                       No nearby bus stops 
                     | 
                  
| Roads in this postcode | |
| Number of UPRNs | 9 View | 
| Known addresses | 
                       Mynydd Bychan, Trecastle 
                       | 
                  
| Main property type | Semi-detached | 
| Businesses | 
                     
                        No businesses found
                     
                   | 
                
| Latitude | 51.954826 | |
|---|---|---|
| Longitude | -3.614049 | |
| Easting | 289180 | |
| Northing | 229713 | |
| Grid reference | SN891297 | |
| UTM reference | 30U 457802 5756191 | |
| what3words | official.refilled.dignitary | |
| FixPhrase | crisping luncheon speller vastly | |
| Plus code | 9C3RX93P+W9 | |
| Altitude | 287 metres (941 feet) | |
| Sunrise (today) | 7:15 | |
| Sunset (today) | 16:42 | |
| Distance away | ||
| Distance to sea | 39.2 KMs (24.4 miles) | 
| Parish | Llywel | W04000325 | 
|---|---|---|
| Ward | Maescar and Llywel | W05001159 | 
| Unitary Authority | Powys | W06000023 | 
| County | Powys | W11000006 | 
| Constituency (2024) | Brecon, Radnor and Cwm Tawe | W07000085 | 
| MP | David Chadwick | Liberal Democrat | 
| Police force | Dyfed-Powys | |
| Water company | Dwr Cymru Welsh Water | |
| NUTS/ITL 3 | Mid 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) | 14 | |
|---|---|---|
| Households (2011) | 5 | |
| 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 | |
| Census output area (2021) | W00002526 | |
| Census output area (2011) | 1A3 | |
| Lower layer super output area (2021) | Powys 020B | W01000474 | 
| Lower layer super output area (2011) | Powys 020B | W01000474 | 
| Middle layer super output area (2021) | Sennybridge & Talybont-on-Usk | W02000414 | 
| Middle layer super output area (2011) | Sennybridge & Talybont-on-Usk | W02000414 | 
| Travel to work area | Brecon | W22000023 | 
| Average property price in Llandrindod Wells | £241,632 | 
|---|---|
| Annual change | -2.1% | 
| Address | Type | Date | Price | 
|---|---|---|---|
| Mynydd Bychan, Trecastle | Semi-detached (freehold) | Dec 2010 | £114,000 |