| 2, Napier Street, Mountain Ash | Freehold | 89 m² | £70,000 (2017) |
| 4, Napier Street, Mountain Ash | Freehold | 59 m² | £58,000 (2018) |
| 6, Napier Street, Mountain Ash | - | 57 m² | - |
| 8, Napier Street, Mountain Ash | Freehold | 56 m² | £59,000 (2016) |
| 9 Napier Street, Mountain Ash | Freehold | 67 m² | £29,000 (2000) |
| 10, Napier Street, Mountain Ash | Freehold | 66 m² | £7,000 (1998) |
| 11 Napier Street, Mountain Ash | Freehold | 71 m² | £40,600 (2019) |
| 14, Napier Street, Mountain Ash | Freehold | 61 m² | £59,000 (2016) |
| 16, Napier Street, Mountain Ash | Freehold | 62 m² | £69,950 (2006) |
| 20 Napier Street, Mountain Ash | - | 57 m² | - |
| 21 Napier Street, Mountain Ash | Freehold | 57 m² | £60,000 (2008) |
| 22 Napier Street, Mid Glamorgan | - | 57 m² | - |
| 23, Napier Street, Mountain Ash | Freehold | 75 m² | £55,000 (2017) |
| 24 Napier Street, Mountain Ash, Mountain Ash | Freehold | 59 m² | £89,000 (2024) |
| 27 Napier Street, Mountain Ash | Freehold | 87 m² | £15,000 (2002) |
| 28 Napier Street, Mountain Ash | Freehold | 53 m² | £63,000 (2024) |
| 30, Napier Street, Mountain Ash | Freehold | 56 m² | £78,500 (2023) |
| 31 Napier Street, Mountain Ash | Freehold | 76 m² | £112,000 (2025) |
| 32 Napier Street, Mountain Ash | Freehold | 54 m² | £60,000 (2025) |
| 33 Napier Street, Mountain Ash, Mountain Ash | Freehold | 86 m² | £37,000 (2017) |
| 35, Napier Street, Mountain Ash | Freehold | 78 m² | £87,500 (2022) |
| 36 Napier Street, Mountain Ash | Freehold | 58 m² | £72,500 (2021) |
| 37 Napier Street, Mountain Ash | Freehold | 45 m² | £74,500 (2022) |
| 38, Napier Street, Mountain Ash | Freehold | 55 m² | £67,000 (2006) |
| 39, Napier Street, Mountain Ash | Freehold | 90 m² | £60,000 (2015) |
| 41 Napier Street, Mountain Ash | Freehold | 75 m² | £20,500 (2002) |
| 43, Napier Street, Mountain Ash | Freehold | 82 m² | £33,000 (2000) |
| 45 Napier Street, Mountain Ash | Freehold | 73 m² | £119,000 (2024) |
| 47, Napier Street, Mountain Ash | Freehold | 74 m² | £10,000 (1998) |
| 48, Napier Street, Mountain Ash | - | 61 m² | - |
| 49, Napier Street, Mountain Ash | - | 69 m² | - |
| 51, Napier Street, Mountain Ash | Leasehold | 62 m² | £10,000 (1996) |
| 54, Napier Street, Mountain Ash | Freehold | 77 m² | £88,500 (2023) |
| 55 Napier Street, Mountain Ash | Freehold | 77 m² | £85,000 (2024) |
| 57, Napier Street, Mountain Ash | Freehold | 66 m² | £100,000 (2023) |