| 1, Mary Street, Trethomas, Caerphilly | - | 94 m² | - |
| 5, Mary Street, Trethomas, Caerphilly | - | 72 m² | - |
| 6 Mary Street, Trethomas, Caerphilly | Freehold | 88 m² | £150,000 (2024) |
| 7, Mary Street, Trethomas, Caerphilly | Freehold | 78 m² | £109,000 (2018) |
| 8 Mary Street, Trethomas, Caerphilly | Freehold | 84 m² | £75,000 (2011) |
| 9, Mary Street, Trethomas, Caerphilly | Freehold | 121 m² | £124,950 (2017) |
| 10, Mary Street, Trethomas, Caerphilly | Freehold | 87 m² | £127,000 (2022) |
| 11, Mary Street, Trethomas, Caerphilly | Freehold | 87 m² | £102,000 (2017) |
| 12, Mary Street, Trethomas, Caerphilly | - | 82 m² | - |
| 13, Mary Street, Trethomas, Caerphilly | - | 99 m² | - |
| 15 Mary Street, Trethomas, Caerphilly | Freehold | 80 m² | £94,000 (2012) |
| 16 Mary Street, Trethomas, Caerphilly | Freehold | 84 m² | £145,000 (2024) |
| 17, Mary Street, Trethomas, Caerphilly | Freehold | 70 m² | £80,000 (2016) |
| 19 Mary Street, Trethomas, Caerphilly | Freehold | 85 m² | £187,500 (2023) |
| 20 Mary Street, Trethomas, Trethomas | Freehold | 86 m² | £163,500 (2024) |
| 21, Mary Street, Trethomas, Caerphilly | Freehold | 79 m² | £91,000 (2012) |
| 22, Mary Street, Trethomas, Caerphilly | Freehold | 98 m² | £125,000 (2018) |
| 23, Mary Street, Trethomas, Caerphilly | Freehold | 83 m² | £110,000 (2004) |
| 24, Mary Street, Trethomas, Caerphilly | Freehold | 90 m² | £102,000 (2017) |
| 25, Mary Street, Trethomas, Caerphilly | Freehold | 73 m² | £115,500 (2019) |
| 27, Mary Street, Trethomas, Caerphilly | - | 86 m² | - |
| 28, Mary Street, Trethomas, Caerphilly | Freehold | 86 m² | £100,000 (2017) |
| 29 Mary Street, Trethomas, Caerphilly | Freehold | 102 m² | £120,000 (2021) |
| 30, Mary Street, Trethomas, Caerphilly | Freehold | 82 m² | £180,000 (2024) |
| 31 Mary Street, Trethomas, Caerphilly | Freehold | 94 m² | £138,500 (2022) |
| 32 Mary Street, Trethomas, Caerphilly | Freehold | 81 m² | £80,000 (2014) |
| 34 Mary Street, Trethomas, Caerphilly | - | 85 m² | - |
| 35, Mary Street, Trethomas, Caerphilly | Freehold | 95 m² | £37,950 (2001) |
| 37, Mary Street, Trethomas, Caerphilly | Freehold | 87 m² | £151,500 (2021) |
| 39, Mary Street, Trethomas, Caerphilly | Freehold | 77 m² | £146,500 (2023) |
| 40, Mary Street, Trethomas, Caerphilly | Freehold | 90 m² | £110,000 (2016) |
| 41, Mary Street, Trethomas, Caerphilly | Freehold | 78 m² | £150,000 (2023) |
| 42 Mary Street, Trethomas, Caerphilly | Freehold | 79 m² | £188,000 (2026) |
| 43, Mary Street, Trethomas, Caerphilly | Freehold | 85 m² | £138,750 (2020) |
| 44, Mary Street, Trethomas, Caerphilly | Freehold | 86 m² | £170,000 (2026) |
| 46 Mary Street, Trethomas, Caerphilly | Freehold | 75 m² | £78,000 (2014) |
| 47 Mary Street, Trethomas, Caerphilly | Freehold | 81 m² | £141,000 (2025) |
| 48 Mary Street, Trethomas, Caerphilly | Freehold | 85 m² | £112,500 (2007) |
| 49 Mary Street, Trethomas, Caerphilly | Freehold | 87 m² | £115,000 (2021) |
| 50 Mary Street, Trethomas, Trethomas | Freehold | 96 m² | £158,000 (2021) |