DemographicsHilgay is approximately 23.37 square kilometres. In 2016 the population of Hilgay was 19. The population is 50% male and 50% female. On average the monthly mortgage repayments in Hilgay 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.