DemographicsKayena is approximately 10.33 square kilometres. In 2016 the population of Kayena was 219. The population is 50% male and 50% female. On average the monthly mortgage repayments in Kayena are $1400 to $1799. The most common weekly income bracket is $400 to $499 per week. Weekly rents in the area are on average $150 to $199.