DemographicsWeir River is approximately 569.8 square kilometres. In 2016 the population of Weir River was 21. The population is 43% male and 57% female. On average the monthly mortgage repayments in Weir River 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.