DemographicsKoonya is approximately 26.64 square kilometres. In 2016 the population of Koonya was 134. The population is 53% male and 47% female. On average the monthly mortgage repayments in Koonya are $1000 to $1399. The most common weekly income bracket is $400 to $499 per week. Weekly rents in the area are on average $100 to $149.