DemographicsIllinbah is approximately 19.4 square kilometres. In 2016 the population of Illinbah was 129. The population is 54% male and 46% female. On average the monthly mortgage repayments in Illinbah are $1000 to $1399. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $225 to $275.