Helidon is a rural town and locality in the Lockyer Valley Region, Queensland, Australia. In the 2021 census, the locality of Helidon ha…Helidon is a rural town and locality in the Lockyer Valley Region, Queensland, Australia. In the 2021 census, the locality of Helidon had a population of 1,130 people. Helidon is known in Queensland for its high quality sandstone, used extensively in private and public buildings in the state and elsewhere, including Brisbane City Hall, Brisbane Treasury Building, University of Queensland, and sought after internationally for its quality, especially in China.