DemographicsDerwent Park is approximately 1.68 square kilometres. In 2016 the population of Derwent Park was 657. The population is 53% male and 47% female. On average the monthly mortgage repayments in Derwent Park are $1000 to $1399. The most common weekly income bracket is $400 to $499 per week. Weekly rents in the area are on average $275 to $349.