DemographicsSummer Hill (Inner West - NSW) is approximately 1.2 square kilometres. In 2016 the population of Summer Hill (Inner West - NSW) was 7311. The population is 49% male and 51% female. On average the monthly mortgage repayments in Summer Hill (Inner West - NSW) are $1800 to $2399. The most common weekly income bracket is $1000 to $1249 per week. Weekly rents in the area are on average $350 to $449.