DemographicsStrathkellar is approximately 39.17 square kilometres. In 2016 the population of Strathkellar was 93. The population is 51% male and 49% female. On average the monthly mortgage repayments in Strathkellar are $1000 to $1399. The most common weekly income bracket is $1250 to $1499 per week. Weekly rents in the area are on average $0 to $74.