DemographicsLake Lonsdale is approximately 62.33 square kilometres. In 2016 the population of Lake Lonsdale was 43. The population is 44% male and 56% female. On average the monthly mortgage repayments in Lake Lonsdale 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.