DemographicsWylies Flat is approximately 8.95 square kilometres. In 2016 the population of Wylies Flat was 55. The population is 56% male and 44% female. On average the monthly mortgage repayments in Wylies Flat are $0 to $299. The most common weekly income bracket is $2000 to $2999 per week. Weekly rents in the area are on average $0 to $74.