Thallon is working towards becoming an accredited Queensland Tidy Town. You can tell us what you think by voting in the poll. History and Geography Facts Thallon is a south west Queensland town, 571 kilometres west of Brisbane, located between St George and the border with New South Wales at Mungindi. The town, named after former Queensland Commissioner for Railways, James Forsyth Thallon is located in the Shire of Balonne, with a population of 250 residents. Explorer Thomas