DemographicsWollemi is approximately 709.31 square kilometres. In 2016 the population of Wollemi was 0. The population is 0% male and 0% female. On average the monthly mortgage repayments in Wollemi are $0 to $299. The most common weekly income bracket is $0 to $149 per week. Weekly rents in the area are on average $0 to $74.