DemographicsDevon Park (Qld) is approximately 44.75 square kilometres. In 2016 the population of Devon Park (Qld) was 49. The population is 43% male and 57% female. On average the monthly mortgage repayments in Devon Park (Qld) are $1400 to $1799. The most common weekly income bracket is $1500 to $1749 per week. Weekly rents in the area are on average $0 to $74.