DemographicsSloping Main is approximately 47.97 square kilometres. In 2016 the population of Sloping Main was 47. The population is 55% male and 45% female. On average the monthly mortgage repayments in Sloping Main are $1400 to $1799. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $0 to $74.