DemographicsWannon is approximately 85.94 square kilometres. In 2016 the population of Wannon was 108. The population is 52% male and 48% female. On average the monthly mortgage repayments in Wannon are $1000 to $1399. The most common weekly income bracket is $650 to $799 per week. Weekly rents in the area are on average $0 to $74.