DemographicsSelbourne is approximately 51.26 square kilometres. In 2016 the population of Selbourne was 68. The population is 60% male and 40% female. On average the monthly mortgage repayments in Selbourne are $1400 to $1799. The most common weekly income bracket is $500 to $649 per week. Weekly rents in the area are on average $0 to $74.