Kuusisto Bishop's Castle Ruins are located by the archipelago ring road Saariston Rengastie, south of the Turunväylä road (Finnish National Road 1). Kuusisto is 9 km from Kaarina, 17 km from Turku and 169 km from Helsinki.

Kuusisto Bishop’s Castle Ruins are located at Linnanrauniontie 633, Kaarina.

The parking area does not have an address, but it is located on the left side of Linnanrauniontie at 7.5 kilometres from the Saaristotie intersection. There is a 700 metre walk to the ruins from the parking area.