DemographicsSouthport (Tas.) is approximately 34.54 square kilometres. In 2016 the population of Southport (Tas.) was 135. The population is 58% male and 42% female. On average the monthly mortgage repayments in Southport (Tas.) are $600 to $799. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $225 to $275.