DemographicsKadnook is approximately 116.25 square kilometres. In 2016 the population of Kadnook was 41. The population is 54% male and 46% female. On average the monthly mortgage repayments in Kadnook are $800 to $999. The most common weekly income bracket is $400 to $499 per week. Weekly rents in the area are on average $0 to $74.