DemographicsKennett River is approximately 31.47 square kilometres. In 2016 the population of Kennett River was 41. The population is 55% male and 45% female. On average the monthly mortgage repayments in Kennett River are $1400 to $1799. The most common weekly income bracket is $1000 to $1249 per week. Weekly rents in the area are on average $225 to $275.