DemographicsSimpson (Vic.) is approximately 203.41 square kilometres. In 2016 the population of Simpson (Vic.) was 569. The population is 53% male and 47% female. On average the monthly mortgage repayments in Simpson (Vic.) are $1000 to $1399. The most common weekly income bracket is $500 to $649 per week. Weekly rents in the area are on average $0 to $74.