DemographicsRosalie Plains is approximately 38.8 square kilometres. In 2016 the population of Rosalie Plains was 44. The population is 53% male and 47% female. On average the monthly mortgage repayments in Rosalie Plains are $0 to $299. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $225 to $275.