DemographicsThornton (Qld) is approximately 94.56 square kilometres. In 2016 the population of Thornton (Qld) was 201. The population is 51% male and 49% female. On average the monthly mortgage repayments in Thornton (Qld) are $1800 to $2399. The most common weekly income bracket is $150 to $299 per week. Weekly rents in the area are on average $0 to $74.