DemographicsGrays Gate is approximately 39.32 square kilometres. In 2016 the population of Grays Gate was 38. The population is 64% male and 36% female. On average the monthly mortgage repayments in Grays Gate are $0 to $299. The most common weekly income bracket is $1250 to $1499 per week. Weekly rents in the area are on average $0 to $74.