| | English Name | Japanese Name | Castle Type | Castle Condition | Historical Period | Prefecture | Year Visited | AddedJcastle | GPSLocation |
|---|
| Aburakawa Nobue Yashiki | Aburakawa Nobue Yashiki | 油川信恵屋敷 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.62068, 138.60005 |
| Ahoyama Castle | Ahoyama Castle | 青山城 | Mountaintop | Ruins only | Pre Edo Period | Shiga Prefecture | 2024 | 2024 | 35.05765, 135.85202 |
| Aida Yakata | Aida Yakata | 会田館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.35335, 137.99302 |
| Aika Yashiki | Aika Yashiki | 秋鹿屋敷 | Fortified Manor | Ruins only | Edo Period | Shizuoka Prefecture | Viewer Contributed | 2025 | 34.71337, 137.84806 |
| Aiki Castle (Minochi) | Aiki Castle (Minochi) | 相木城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.66515, 138.20489 |
| Aimiyamamonomi Fort | Aimiyamamonomi Fort | 逢見山物見砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36.02708, 137.90945 |
| Ainuta Fort | Ainuta Fort | 相垈塁 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35.72143, 138.45165 |
| Aizu Wakamatsu Castle | Aizu Wakamatsu Castle | 会津若松城 | Hilltop | Reconstructed main keep | Edo Period | Fukushima Prefecture | 1997
1998
2003
2011 | 1999 | 37.48777, 139.9299 |
| Akagi Kita Castle | Akagi Kita Castle | 赤木北城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.16266, 137.97342 |
| Akagi Minami Castle | Akagi Minami Castle | 赤木南城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36.15552, 137.97314 |
