DemographicsWestbrook (NSW) is approximately 93.73 square kilometres. In 2016 the population of Westbrook (NSW) was 151. The population is 51% male and 49% female. On average the monthly mortgage repayments in Westbrook (NSW) are $1000 to $1399. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $0 to $74.