| Postcode | SA31 1PY | 
|---|---|
| Post Town | Carmarthen | 
| Nearest station | Carmarthen (1 km) | 
| Bus stops | Market Way (SE) Peacocks (W) Dairies Club (SE) Tanners` Arms (E) Bus Station () Bus Station  () | 
| Roads in this postcode | |
| Number of UPRNs | 22 View | 
| Known addresses | 4 Water Street, Carmarthen 8 Water Street, Carmarthen 9 Water Street, Carmarthen 10A Water Street, Carmarthen 12 Water Street, Carmarthen | 
| Main property type | Terraced | 
| Businesses | 
| Latitude | 51.85731 | |
|---|---|---|
| Longitude | -4.311327 | |
| Easting | 240924 | |
| Northing | 220162 | |
| Grid reference | SN409201 | |
| UTM reference | 30U 409692 5745980 | |
| what3words | vanish.silent.melon | |
| FixPhrase | crisped luminous splashy unbroken | |
| Plus code | 9C3QVM4Q+WF | |
| Altitude | 18 metres (59 feet) | |
| Sunrise (today) | 7:11 | |
| Sunset (today) | 16:53 | |
| Distance away | ||
| Distance to sea | 4.6 KMs (2.9 miles) | 
| Parish | Carmarthen | W04000494 | 
|---|---|---|
| Ward | Carmarthen Town North and South | W05001183 | 
| 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) | 19 | |
|---|---|---|
| Households (2011) | 7 | |
| Index of Multiple Deprivation (2019) | Most deprivedLeast deprived | |
| Average household income (2020) | Lowest (£22,200)
                        Highest (£108,100)
                       | |
| Rural/urban (2021) | Urban: Further from a major town or city | |
| Rural/urban (2011) | Urban city and town in a sparse setting | |
| Built up area (2024) | Carmarthen | W45000937 | 
| Census output area (2021) | W00003451 | |
| Census output area (2011) | 7A1 | |
| Lower layer super output area (2021) | Carmarthenshire 008A | W01000641 | 
| Lower layer super output area (2011) | Carmarthenshire 008A | W01000641 | 
| Middle layer super output area (2021) | Carmarthen South & Llangynnwr | W02000149 | 
| Middle layer super output area (2011) | Carmarthen South & Llangynnwr | W02000149 | 
| Travel to work area | Llanelli | W22000028 | 
| Average property price in Swansea | £199,131 | 
|---|---|
| Annual change | 2.4% | 
| Address | Type | Date | Price | 
|---|---|---|---|
| 4 Water Street, Carmarthen | Other (freehold) | Jun 2021 | £90,000 | 
| 8 Water Street, Carmarthen | Terraced (freehold) | Jul 2017 | £110,000 | 
| 9 Water Street, Carmarthen | Terraced (freehold) | Jul 2017 | £110,000 | 
| Terraced (freehold) | Mar 2002 | £62,000 | |
| 12 Water Street, Carmarthen | Terraced (freehold) | Feb 2005 | £59,950 | 
| 10A Water Street, Carmarthen | Semi-detached (freehold) | Apr 2002 | £48,000 |