Humpty Doo is a town in Australia's Northern Territory, situated just south of the Arnhem Highway, approximately 40 km from Darwin. At the 20…Humpty Doo is a town in Australia's Northern Territory, situated just south of the Arnhem Highway, approximately 40 km from Darwin. At the 2016 census, Humpty Doo had a population of 4,313 people. Its local government area is Litchfield Municipality. The town is a popular stopping point for tourists travelling between Darwin and Kakadu National Park, and boasts many attractions of its own. The main industries are agriculture and tourism; however, most residents commute to Darwin or Palmerston for work, and many regard it as a dormitory town.