DemographicsFormartin is approximately 133.22 square kilometres. In 2016 the population of Formartin was 95. The population is 55% male and 45% female. On average the monthly mortgage repayments in Formartin are $0 to $299. The most common weekly income bracket is $1000 to $1249 per week. Weekly rents in the area are on average $0 to $74.