DemographicsMillbrook (Vic.) is approximately 39.3 square kilometres. In 2016 the population of Millbrook (Vic.) was 156. The population is 49% male and 51% female. On average the monthly mortgage repayments in Millbrook (Vic.) are $1800 to $2399. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $150 to $199.