DemographicsSt Helens (Vic.) is approximately 47.21 square kilometres. In 2016 the population of St Helens (Vic.) was 47. The population is 50% male and 50% female. On average the monthly mortgage repayments in St Helens (Vic.) are $0 to $299. The most common weekly income bracket is $650 to $799 per week. Weekly rents in the area are on average $0 to $74.