DemographicsGunnewin is approximately 422.72 square kilometres. In 2016 the population of Gunnewin was 59. The population is 53% male and 47% female. On average the monthly mortgage repayments in Gunnewin are $1000 to $1399. The most common weekly income bracket is $650 to $799 per week. Weekly rents in the area are on average $0 to $74.