DemographicsHirstglen is approximately 42.89 square kilometres. In 2016 the population of Hirstglen was 83. The population is 45% male and 55% female. On average the monthly mortgage repayments in Hirstglen are $0 to $299. The most common weekly income bracket is $400 to $499 per week. Weekly rents in the area are on average $200 to $224.