Calliope is a rural town and locality in the Gladstone Region, Queensland, Australia. In the 2021 census, the locality of Calliope had a populatio…Calliope is a rural town and locality in the Gladstone Region, Queensland, Australia. In the 2021 census, the locality of Calliope had a population of 5,263 people. Calliope is near the 'cross-roads' of the Bruce Highway and the Dawson Highway in Central Queensland, 20 kilometres SSW of the port city of Gladstone. Gladstone–Monto Road runs south from the Dawson Highway through the locality.