DemographicsRelbia is approximately 20.43 square kilometres. In 2016 the population of Relbia was 678. The population is 50% male and 50% female. On average the monthly mortgage repayments in Relbia are $3000 to $3999. The most common weekly income bracket is $500 to $649 per week. Weekly rents in the area are on average $200 to $224.