| | 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° 37' 14.45" N, 138° 36' 0.18" E |
| Aida Yakata | Aida Yakata | 会田館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36° 21' 12.06" N, 137° 59' 34.87" E |
| Aiki Castle (Minochi) | Aiki Castle (Minochi) | 相木城 | Flatland | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36° 39' 54.54" N, 138° 12' 17.60" E |
| Aimiyamamonomi Fort | Aimiyamamonomi Fort | 逢見山物見砦 | Mountaintop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2022 | 36° 1' 37.49" N, 137° 54' 34.02" E |
| Ainuta Fort | Ainuta Fort | 相垈塁 | Fortified Manor | Ruins only | Pre Edo Period | Yamanashi Prefecture | Viewer Contributed | 2022 | 35° 43' 17.15" N, 138° 27' 5.94" E |
| 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° 29' 15.97" N, 139° 55' 47.64" E |
| Akagi Kita Castle | Akagi Kita Castle | 赤木北城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36° 9' 45.58" N, 137° 58' 24.31" E |
| Akagi Minami Castle | Akagi Minami Castle | 赤木南城 | Hilltop | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2020 | 36° 9' 19.87" N, 137° 58' 23.30" E |
| Akagi Yakata | Akagi Yakata | 赤木館 | Fortified Manor | Ruins only | Pre Edo Period | Nagano Prefecture | Viewer Contributed | 2021 | 36° 9' 41.80" N, 137° 58' 16.18" E |
| Akasaka Jin'ya | Akasaka Jin'ya | 赤坂陣屋 | Fortified Manor | No main keep but other buildings | Edo Period | Aichi Prefecture | Viewer Contributed | 2023 | 34° 51' 21.78" N, 137° 18' 24.19" E |
