Nyngan is a town in the centre of New South Wales, Australia, in the Bogan Shire local government area within the Orana Region of centr…Nyngan is a town in the centre of New South Wales, Australia, in the Bogan Shire local government area within the Orana Region of central New South Wales. At the 2016 census, Nyngan had a population of 1,988 people. Nyngan is situated on the Bogan River between Narromine and Bourke, on the junction of the Mitchell Highway and Barrier Highway, 656 km south of Charleville and 576 km north-west of Sydney by road. The Barrier Highway starts at Nyngan, and runs west to Cobar and on through Wilcannia and Broken Hill into South Australia.