The size of Dunoon is approximately 30.5 square kilometres. It has 3 parks. The population of Dunoon in 2011 was 823 people. By 2016 the population was 701 showing a population decline of 14.8% in the area during that time. The predominant age group in Dunoon is 50-59 years. Households in Dunoon are primarily childless couples and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Dunoon work in a professional occupation. In 2011, 79.4% of the homes in Dunoon were owner-occupied compared with 75.6% in 2016. Currently the median sales price of houses in the area is $815,000.