DemographicsRedcastle is approximately 62.59 square kilometres. In 2016 the population of Redcastle was 68. The population is 48% male and 52% female. On average the monthly mortgage repayments in Redcastle are $1800 to $2399. The most common weekly income bracket is $1000 to $1249 per week. Weekly rents in the area are on average $0 to $74.