| 2 Penn Street, Treharris | Freehold | 65 m² | £44,000 (2008) |
| 5 Penn Street, Treharris | - | 62 m² | - |
| 6, Penn Street, Treharris | Freehold | 86 m² | £83,500 (2010) |
| 8 Penn Street, Treharris | Freehold | 93 m² | £90,000 (2025) |
| 9 Penn Street, Treharris, Treharris | Freehold | 85 m² | £129,000 (2026) |
| 12, Penn Street, Treharris | - | 97 m² | - |
| 13 Penn Street, Treharris | Freehold | 96 m² | £25,000 (2015) |
| 15, Penn Street, Treharris | Freehold | 123 m² | £110,000 (2007) |
| 18 Penn Street, Treharris | Freehold | 72 m² | £78,950 (2006) |
| 19, Penn Street, Treharris | Freehold | 76 m² | £84,000 (2025) |
| 21, Penn Street, Treharris | Freehold | 84 m² | £67,000 (2018) |
| 22, Penn Street, Treharris | Freehold | 88 m² | £23,000 (2000) |
| 23 Penn Street, Treharris | - | 77 m² | - |
| 24, Penn Street, Treharris | Freehold | 69 m² | £115,000 (2023) |
| 25 Penn Street, Treharris, Treharris | Freehold | 66 m² | £110,000 (2025) |
| 26, Penn Street, Treharris | Freehold | 96 m² | £10,750 (1999) |
| 27 Penn Street, Treharris | Freehold | 68 m² | £77,500 (2017) |
| 30, Penn Street, Treharris | Freehold | 85 m² | £48,000 (2006) |
| 31, Penn Street, Treharris | Freehold | 88 m² | £87,000 (2021) |
| 33, Penn Street, Treharris | Freehold | 87 m² | £91,000 (2018) |
| 35, Penn Street, Treharris | Freehold | 65 m² | £40,000 (2013) |
| 36 Penn Street, Treharris | Freehold | 89 m² | £67,000 (2014) |
| 37 Penn Street, Treharris | Freehold | 70 m² | £58,200 (2016) |
| 40, Penn Street, Treharris | Freehold | 81 m² | £70,000 (2018) |
| 41B Penn Street, Treharris | - | 84 m² | - |
| 42 Penn Street, Treharris | Freehold | 113 m² | £84,000 (2022) |
| 43, Penn Street, Treharris | Freehold | 79 m² | £84,000 (2024) |
| 44, Penn Street, Treharris | Freehold | 78 m² | £107,950 (2025) |
| 45 Penn Street, Treharris | Freehold | 75 m² | £92,000 (2025) |
| 47 Penn Street, Treharris | Freehold | 68 m² | £140,000 (2023) |
| 49 Penn Street, Treharris | Freehold | 77 m² | £35,000 (2014) |
| 50, Penn Street, Treharris | Freehold | 87 m² | £105,000 (2023) |
| 52 Penn Street, Treharris, Treharris | Freehold | 78 m² | £86,000 (2021) |
| 54, Penn Street, Treharris | Freehold | 109 m² | £137,000 (2023) |