| 1, William Street, Merthyr Tydfil | Freehold | 88 m² | £36,000 (1995) |
| 1A, William Street, Merthyr Tydfil | Freehold | 89 m² | £28,000 (2003) |
| 3, William Street, Merthyr Tydfil | Freehold | 76 m² | £67,500 (2018) |
| 4 William Street, Merthyr Tydfil | Freehold | 65 m² | £85,000 (2022) |
| 5, William Street, Merthyr Tydfil | Freehold | 71 m² | £127,000 (2026) |
| 6 William Street, Merthyr Tydfil | Freehold | 88 m² | £125,000 (2025) |
| 8 William Street, Merthyr Tydfil | Freehold | 78 m² | £60,000 (2003) |
| 10, William Street, Merthyr Tydfil | Freehold | 96 m² | £27,000 (2002) |
| 12, William Street, Merthyr Tydfil | Freehold | 75 m² | £89,500 (2009) |
| 13 William Street, Merthyr Tydfil | Freehold | 70 m² | £75,000 (2019) |
| 15, William Street, Merthyr Tydfil | Freehold | 78 m² | £90,000 (2014) |
| 16, William Street, Merthyr Tydfil | Freehold | 71 m² | £85,500 (2016) |
| 17, William Street, Merthyr Tydfil | Freehold | 74 m² | £62,500 (2006) |
| 19, William Street, Merthyr Tydfil | Freehold | 94 m² | £69,950 (2019) |
| 21 William Street, Merthyr Tydfil | Freehold | 94 m² | £109,000 (2022) |
| 22, William Street, Merthyr Tydfil | Leasehold | 92 m² | £78,000 (2016) |
| 24 William Street, Twynyrodyn, Merthyr Tydfil, Merthyr Tydfil | Freehold | 105 m² | £162,450 (2025) |
| 25 William Street, Merthyr Tydfil | - | 95 m² | - |
| 28, William Street, Merthyr Tydfil | Freehold | 120 m² | £102,000 (2021) |
| 29, William Street, Merthyr Tydfil | Freehold | 99 m² | £125,000 (2020) |
| 32, William Street, Merthyr Tydfil | Freehold | 82 m² | £45,000 (2004) |
| 33, William Street, Merthyr Tydfil | Freehold | 90 m² | £31,000 (1998) |
| 36 William Street, Merthyr Tydfil | Freehold | 101 m² | £50,000 (2014) |
| 37 William Street, Merthyr Tydfil | Freehold | 100 m² | £125,000 (2026) |
| 38 William Street, Merthyr Tydfil | - | 93 m² | - |
| 39, William Street, Merthyr Tydfil | Freehold | 100 m² | £78,000 (2016) |
| 40 William Street, Merthyr Tydfil | Freehold | 225 m² | £155,000 (2023) |