DemographicsAvoca (Tas.) is approximately 393.8 square kilometres. In 2016 the population of Avoca (Tas.) was 216. The population is 48% male and 52% female. On average the monthly mortgage repayments in Avoca (Tas.) are $300 to $449. The most common weekly income bracket is $150 to $299 per week. Weekly rents in the area are on average $150 to $199.