DemographicsLower Mangrove is approximately 16.54 square kilometres. In 2016 the population of Lower Mangrove was 65. The population is 61% male and 39% female. On average the monthly mortgage repayments in Lower Mangrove are $0 to $299. The most common weekly income bracket is $650 to $799 per week. Weekly rents in the area are on average $0 to $74.