DemographicsMount Seymour is approximately 29.34 square kilometres. In 2016 the population of Mount Seymour was 75. The population is 46% male and 54% female. On average the monthly mortgage repayments in Mount Seymour are $300 to $449. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $0 to $74.