DemographicsBlackbutt (Qld) is approximately 7.91 square kilometres. In 2016 the population of Blackbutt (Qld) was 836. The population is 50% male and 50% female. On average the monthly mortgage repayments in Blackbutt (Qld) are $800 to $999. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $225 to $275.