DemographicsLewisham (Tas.) is approximately 1.89 square kilometres. In 2016 the population of Lewisham (Tas.) was 691. The population is 50% male and 50% female. On average the monthly mortgage repayments in Lewisham (Tas.) are $1800 to $2399. The most common weekly income bracket is $400 to $499 per week. Weekly rents in the area are on average $275 to $349.