| Flat 1, Castle Court, Maryport Street, Usk | Leasehold | 50 m² | £92,500 (2024) |
| Flat 2 Castle Court, Maryport Street, Usk | - | 35 m² | - |
| Flat 3, Castle Court, Maryport Street, Usk | Leasehold | 40 m² | £88,000 (2024) |
| Flat 4, Castle Court, Maryport Street, Usk | Leasehold | 47 m² | £102,000 (2026) |
| Flat 5, Castle Court, Maryport Street, Usk | Leasehold | 47 m² | £90,000 (2015) |
| Flat 6, Castle Court, Maryport Street, Usk | Leasehold | 38 m² | £83,000 (2022) |
| Flat 7, Castle Court, Maryport Street, Usk | Leasehold | 49 m² | £95,000 (2025) |
| Flat 8, Castle Court, Maryport Street, Usk | Leasehold | 41 m² | £62,500 (2016) |
| Flat 9, Castle Court, Maryport Street, Usk | Leasehold | 38 m² | £74,000 (2021) |
| Flat 10, Castle Court, Maryport Street, Usk | Leasehold | 50 m² | £110,000 (2025) |
| Flat 11, Castle Court, Maryport Street, Usk | Leasehold | 52 m² | £102,000 (2025) |
| Flat 12, Castle Court, Maryport Street, Usk | Leasehold | 47 m² | £85,000 (2025) |
| Flat 14, Castle Court, Maryport Street, Usk | Leasehold | 42 m² | £70,000 (2018) |
| Flat 15, Castle Court, Maryport Street, Usk | Leasehold | 43 m² | £84,000 (2024) |
| Flat 16 Castle Court, Maryport Street, Usk | Leasehold | 46 m² | £84,500 (2016) |
| Flat 17, Castle Court, Maryport Street, Usk | Leasehold | 40 m² | £65,000 (2016) |
| Flat 18, Castle Court, Maryport Street, Usk | Leasehold | 47 m² | £86,500 (2016) |
| Flat 19, Castle Court, Maryport Street, Usk | Leasehold | 40 m² | £77,500 (2024) |
| Flat 20, Castle Court, Maryport Street, Usk | Leasehold | 40 m² | £82,500 (2023) |
| Flat 21, Castle Court, Maryport Street, Usk | Leasehold | 50 m² | £97,500 (2017) |
| Flat 22, Castle Court, Maryport Street, Usk | Leasehold | 42 m² | £82,950 (2012) |
| Flat 23, Castle Court, Maryport Street, Usk | Leasehold | 43 m² | £63,500 (2016) |
| Flat 24, Castle Court, Maryport Street, Usk | Leasehold | 48 m² | £91,500 (2025) |
| Flat 25, Castle Court, Maryport Street, Usk | Leasehold | 40 m² | £85,000 (2004) |
| Flat 26, Castle Court, Maryport Street, Usk | Leasehold | 49 m² | £89,000 (2019) |
| Flat 27, Castle Court, Maryport Street, Usk | Leasehold | 43 m² | £84,000 (2023) |
| Flat 28, Castle Court, Maryport Street, Usk | Leasehold | 40 m² | £67,995 (2021) |
| Flat 29, Castle Court, Maryport Street, Usk | Leasehold | 50 m² | £40,000 (1999) |