| Postcode | CF83 8DQ | 
|---|---|
| Post Town | Caerphilly | 
| Nearest station | Energlyn and Churchill Park (3 km) | 
| Bus stops | Redbrook Avenue (W) Redbrook Avenue (E) Upper Glyn-gwyn Street (W) Upper Glyn-gwyn Street (E) The Square (W) Navigation Street (SE) | 
| Roads in this postcode | |
| Number of UPRNs | 46 View | 
| Known addresses | 1 William Street, Trethomas 2 William Street, Trethomas 5 William Street, Trethomas 6 William Street, Trethomas 8 William Street, Trethomas 9 William Street, Trethomas 12 William Street, Trethomas 13 William Street, Trethomas 16 William Street, Trethomas 17 William Street, Trethomas 19 William Street, Trethomas 20 William Street, Trethomas 21 William Street, Trethomas 22 William Street, Trethomas 23 William Street, Trethomas 25 William Street, Trethomas 26 William Street, Trethomas 29 William Street, Trethomas 31 William Street, Trethomas 32 William Street, Trethomas 33 William Street, Trethomas 35 William Street, Trethomas 37 William Street, Trethomas 39 William Street, Trethomas 41 William Street, Trethomas 43 William Street, Trethomas 47 William Street, Trethomas 49 William Street, Trethomas | 
| Main property type | Terraced | 
| Businesses | 
| Latitude | 51.592601 | |
|---|---|---|
| Longitude | -3.180538 | |
| Easting | 318317 | |
| Northing | 188855 | |
| Grid reference | ST183888 | |
| UTM reference | 30U 487493 5715743 | |
| what3words | buildings.starfish.rainy | |
| FixPhrase | cringing lure suggest unstitch | |
| Plus code | 9C3RHRV9+2Q | |
| Altitude | 68 metres (222 feet) | |
| Sunrise (today) | 7:05 | |
| Sunset (today) | 16:49 | |
| Distance away | ||
| Distance to sea | 12.1 KMs (7.5 miles) | 
| Parish | Bedwas, Trethomas and Machen | W04000729 | 
|---|---|---|
| Ward | Bedwas and Trethomas | W05001652 | 
| Unitary Authority | Caerphilly | W06000018 | 
| County | Gwent | W11000003 | 
| Constituency (2024) | Caerphilly | W07000088 | 
| MP | Chris Evans | Labour | 
| Police force | Gwent | |
| Water company | Dwr Cymru Welsh Water | |
| NUTS/ITL 3 | Gwent Valleys | |
| NUTS/ITL 2 | South East Wales | |
| NUTS/ITL 1 | Wales | |
| Country | Wales | W92000004 | 
| Date introduced | June 1999 | 
|---|---|
| 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) | 114 | |
|---|---|---|
| Households (2011) | 41 | |
| Index of Multiple Deprivation (2019) | Most deprivedLeast deprived | |
| Average household income (2020) | Lowest (£22,200)
                        Highest (£108,100)
                       | |
| Rural/urban (2021) | Urban: Nearer to a major town or city | |
| Rural/urban (2011) | Urban city and town | |
| Built up area (2024) | Bedwas | W45001162 | 
| Census output area (2021) | W00007045 | |
| Census output area (2011) | 8B1 | |
| Lower layer super output area (2021) | Caerphilly 020D | W01001346 | 
| Lower layer super output area (2011) | Caerphilly 020D | W01001346 | 
| Middle layer super output area (2021) | Bedwas & Trethomas | W02000309 | 
| Middle layer super output area (2011) | Bedwas & Trethomas | W02000309 | 
| Travel to work area | Cardiff | W22000024 | 
| Average property price in Cardiff | £221,509 | 
|---|---|
| Annual change | 2.2% | 
| Address | Type | Date | Price | 
|---|---|---|---|
| 13 William Street, Trethomas | Terraced (freehold) | Oct 2024 | £160,000 | 
| Terraced (freehold) | Jan 2019 | £122,500 | |
| Terraced (freehold) | Jan 2007 | £114,000 | |
| Terraced (freehold) | Oct 2003 | £81,000 | |
| Terraced (freehold) | Jan 1999 | £41,000 | |
| 41 William Street, Trethomas | Terraced (freehold) | Aug 2024 | £157,000 | 
| Terraced (freehold) | Aug 2005 | £85,000 | |
| Terraced (freehold) | Nov 2001 | £46,950 | |
| Terraced (freehold) | Jul 1996 | £24,000 | |
| 17 William Street, Trethomas | Terraced (freehold) | Apr 2024 | £175,000 | 
| Terraced (freehold) | Jul 2009 | £76,750 | |
| Terraced (freehold) | Nov 2006 | £118,000 | |
| Terraced (freehold) | Sep 1999 | £42,000 | |
| 49 William Street, Trethomas | Terraced (freehold) | Nov 2023 | £153,000 | 
| Terraced (freehold) | Jan 2022 | £155,000 | |
| Terraced (freehold) | Jan 2014 | £112,000 | |
| Terraced (freehold) | Sep 2009 | £109,950 | |
| 9 William Street, Trethomas | Terraced (freehold) | Nov 2022 | £161,000 | 
| Terraced (freehold) | Oct 2018 | £119,950 | |
| Terraced (freehold) | Jul 2006 | £109,950 | |
| Terraced (freehold) | Dec 1997 | £35,500 | |
| 35 William Street, Trethomas | Terraced (freehold) | Jun 2022 | £155,000 | 
| Terraced (freehold) | Jun 2012 | £90,000 | |
| 26 William Street, Trethomas | Terraced (freehold) | Feb 2021 | £147,500 | 
| Terraced (freehold) | Apr 2007 | £125,000 | |
| Terraced (freehold) | Jun 2005 | £102,000 | |
| Terraced (freehold) | Jul 2003 | £73,000 | |
| Terraced (freehold) | Aug 2001 | £46,315 | |
| 37 William Street, Trethomas | Terraced (freehold) | Nov 2020 | £115,000 | 
| Terraced (freehold) | Jul 2006 | £125,000 | |
| Terraced (freehold) | Jan 2004 | £84,500 | |
| Terraced (freehold) | Jul 2000 | £44,950 | |
| Terraced (freehold) | Apr 1998 | £41,000 | |
| 2 William Street, Trethomas | Terraced (freehold) | Feb 2019 | £122,000 | 
| Terraced (freehold) | Apr 2005 | £92,000 | |
| Terraced (freehold) | May 1999 | £39,950 | |
| 8 William Street, Trethomas | Terraced (freehold) | Feb 2018 | £118,500 | 
| Terraced (freehold) | Feb 2014 | £79,000 |