DemographicsDerby (Vic.) is approximately 37.88 square kilometres. In 2016 the population of Derby (Vic.) was 17. The population is 56% male and 44% female. On average the monthly mortgage repayments in Derby (Vic.) are $0 to $299. The most common weekly income bracket is $500 to $649 per week. Weekly rents in the area are on average $0 to $74.