DemographicsCornwall (Tas.) is approximately 5.42 square kilometres. In 2016 the population of Cornwall (Tas.) was 65. The population is 48% male and 52% female. On average the monthly mortgage repayments in Cornwall (Tas.) are $300 to $449. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $0 to $74.