DemographicsRetreat (Tas.) is approximately 45.53 square kilometres. In 2016 the population of Retreat (Tas.) was 18. The population is 44% male and 56% female. On average the monthly mortgage repayments in Retreat (Tas.) are $0 to $299. The most common weekly income bracket is $0 to $149 per week. Weekly rents in the area are on average $0 to $74.