DemographicsBen Lomond (NSW) is approximately 277.97 square kilometres. In 2016 the population of Ben Lomond (NSW) was 152. The population is 51% male and 49% female. On average the monthly mortgage repayments in Ben Lomond (NSW) are $800 to $999. The most common weekly income bracket is $500 to $649 per week. Weekly rents in the area are on average $150 to $199.