DemographicsWallumbilla South is approximately 770.49 square kilometres. In 2016 the population of Wallumbilla South was 62. The population is 52% male and 48% female. On average the monthly mortgage repayments in Wallumbilla South are $0 to $299. The most common weekly income bracket is $150 to $299 per week. Weekly rents in the area are on average $0 to $74.