DemographicsGrassmere is approximately 98.58 square kilometres. In 2016 the population of Grassmere was 402. The population is 52% male and 48% female. On average the monthly mortgage repayments in Grassmere are $1000 to $1399. The most common weekly income bracket is $800 to $999 per week. Weekly rents in the area are on average $0 to $74.