DemographicsMailors Flat is approximately 16.13 square kilometres. In 2016 the population of Mailors Flat was 425. The population is 51% male and 49% female. On average the monthly mortgage repayments in Mailors Flat are $1800 to $2399. The most common weekly income bracket is $1000 to $1249 per week. Weekly rents in the area are on average $0 to $74.