| 4 Duffryn Street, Mountain Ash | Freehold | 67 m² | £95,000 (2023) |
| 5, Duffryn Street, Mountain Ash | Freehold | 68 m² | £75,000 (2023) |
| 6 Duffryn Street, Mountain Ash | Freehold | 67 m² | £66,000 (2023) |
| 7 Duffryn Street, Mountain Ash | Freehold | 69 m² | £45,000 (2016) |
| 8, Duffryn Street, Mountain Ash | Freehold | 66 m² | £59,770 (2007) |
| 9, Duffryn Street, Mountain Ash | Freehold | 81 m² | £110,000 (2022) |
| 10, Duffryn Street, Mountain Ash | Freehold | 96 m² | £120,000 (2021) |
| 11, Duffryn Street, Mountain Ash | - | 54 m² | - |
| 12, Duffryn Street, Mountain Ash | Freehold | 60 m² | £47,500 (2016) |
| 13 Duffryn Street, Mountain Ash | Freehold | 79 m² | £65,000 (2022) |
| 15 Duffryn Street, Mountain Ash | Freehold | 71 m² | £27,000 (2002) |
| 16 Duffryn Street, Mountain Ash | Freehold | 70 m² | £83,000 (2021) |
| 17, Duffryn Street, Mountain Ash | - | 72 m² | - |
| 18, Duffryn Street, Mountain Ash | Freehold | 61 m² | £52,000 (2018) |
| 19, Duffryn Street, Mountain Ash | - | 65 m² | - |
| 21, Duffryn Street, Mountain Ash | Freehold | 69 m² | £36,000 (2018) |
| 23, Duffryn Street, Mountain Ash | Freehold | 76 m² | £42,000 (2003) |
| 24, Duffryn Street, Mountain Ash | Freehold | 75 m² | £70,000 (2019) |
| 25 Duffryn Street, Mountain Ash | Freehold | 55 m² | £20,500 (1998) |
| 26 Duffryn Street, Mountain Ash | Freehold | 58 m² | £78,000 (2021) |
| 28 Duffryn Street, Mountain Ash | Freehold | 64 m² | £81,000 (2024) |
| 29, Duffryn Street, Mountain Ash | - | 46 m² | - |
| 30 Duffryn Street, Mountain Ash | Freehold | 55 m² | £72,500 (2022) |
| 31, Duffryn Street, Mountain Ash | Freehold | 71 m² | £64,000 (2018) |
| 32, Duffryn Street, Mountain Ash | Freehold | 59 m² | £62,000 (2019) |
| 33 Duffryn Street, Mountain Ash | Freehold | 63 m² | £95,000 (2025) |
| 34, Duffryn Street, Mountain Ash | Freehold | 70 m² | £69,950 (2011) |
| 35 Duffryn Street, Mountain Ash | Freehold | 81 m² | £84,000 (2021) |
| 37, Duffryn Street, Mountain Ash | Freehold | 82 m² | £52,000 (2017) |
| Ground Floor Flat, 2 Duffryn Street, Mountain Ash | - | 44 m² | - |