DemographicsMoonan Flat is approximately 152.27 square kilometres. In 2016 the population of Moonan Flat was 128. The population is 54% male and 46% female. On average the monthly mortgage repayments in Moonan Flat are $1800 to $2399. The most common weekly income bracket is $500 to $649 per week. Weekly rents in the area are on average $0 to $74.