DemographicsFlintstone is approximately 0.45 square kilometres. In 2016 the population of Flintstone was 4. The population is 100% male and 0% female. On average the monthly mortgage repayments in Flintstone are $0 to $299. The most common weekly income bracket is $150 to $299 per week. Weekly rents in the area are on average $0 to $74.