DemographicsMissen Flat is approximately 11.72 square kilometres. In 2016 the population of Missen Flat was 20. The population is 57% male and 43% female. On average the monthly mortgage repayments in Missen Flat are $1800 to $2399. The most common weekly income bracket is $800 to $999 per week. Weekly rents in the area are on average $0 to $74.