DemographicsGladstone (Tas.) is approximately 327.98 square kilometres. In 2016 the population of Gladstone (Tas.) was 139. The population is 48% male and 52% female. On average the monthly mortgage repayments in Gladstone (Tas.) are $800 to $999. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $0 to $74.