DemographicsMoonan Brook is approximately 199.22 square kilometres. In 2016 the population of Moonan Brook was 23. The population is 63% male and 37% female. On average the monthly mortgage repayments in Moonan Brook are $0 to $299. The most common weekly income bracket is $800 to $999 per week. Weekly rents in the area are on average $0 to $74.