DemographicsStonehaven is approximately 27.65 square kilometres. In 2016 the population of Stonehaven was 81. The population is 53% male and 48% female. On average the monthly mortgage repayments in Stonehaven are $3000 to $3999. The most common weekly income bracket is $400 to $499 per week. Weekly rents in the area are on average $0 to $74.