| 1 Mary Street, Mountain Ash | Freehold | 90 m² | £59,995 (2005) |
| 2, Mary Street, Mountain Ash | Freehold | 59 m² | £56,000 (2016) |
| 4 Mary Street, Mountain Ash | - | 77 m² | - |
| 5 St. Mary'S Close, Mary Street, Mountain Ash | - | 101 m² | - |
| 7, Mary Street, Mountain Ash | Freehold | 69 m² | £75,000 (2016) |
| 10, Mary Street, Mountain Ash | - | 77 m² | - |
| 12, Mary Street, Mountain Ash | Freehold | 84 m² | £66,000 (2020) |
| 13, Mary Street, Mountain Ash | Freehold | 70 m² | £70,000 (2019) |
| 14 Mary Street, Mountain Ash | Freehold | 82 m² | £127,500 (2023) |
| 15, Mary Street, Mountain Ash | Freehold | 93 m² | £62,750 (2017) |
| 16, Mary Street, Mountain Ash | Freehold | 76 m² | £16,000 (1998) |
| 17 Mary Street, Mountain Ash | Freehold | 69 m² | £110,000 (2024) |
| 19 Mary Street, Mountain Ash | Freehold | 65 m² | £90,000 (2023) |
| 20, Mary Street, Mountain Ash | Freehold | 74 m² | £45,000 (2018) |
| 23, Mary Street, Mountain Ash | Freehold | 67 m² | £58,000 (2013) |
| 25, Mary Street, Mountain Ash | Freehold | 75 m² | £18,000 (2000) |
| 27, Mary Street, Mountain Ash | Freehold | 85 m² | £82,000 (2020) |
| 30, Mary Street, Mountain Ash | - | 67 m² | - |
| 31 Mary Street, Mountain Ash | Freehold | 80 m² | £44,500 (2015) |
| 32, Mary Street, Mountain Ash | Freehold | 73 m² | £4,500 (2018) |
| 33 Mary Street, Mountain Ash | Freehold | 66 m² | £100,000 (2023) |
| 35 Mary Street, Mountain Ash | Freehold | 66 m² | £75,000 (2020) |
| 36 Mary Street, Mountain Ash | Freehold | 79 m² | £89,000 (2025) |
| 37, Mary Street, Mountain Ash | - | 74 m² | - |
| 38, Mary Street, Mountain Ash | Freehold | 82 m² | £18,000 (1996) |
| 42 Mary Street, Mountain Ash | Freehold | 67 m² | £85,000 (2021) |
| Ashleigh, Mary Street, Mountain Ash | Freehold | 165 m² | £158,000 (2019) |
| St. Dyfrigs Church House, Mary Street, Mountain Ash | - | 54 m² | - |