Mt Isa is technically the largest city in the world, as the town of Camooweal is a suburb of it. "Mount Isa proudly claims to be the largest city in the world. The argument is that the city extends for 43,188 square kilometres, and that the road from Mount Isa to Camooweal, a distance of 189 km, is the longest city road in the world."
Mount Isa, QLD - Aussie Towns

