The size of Mount Dutton Bay is approximately 7.7 square kilometres. The population of Mount Dutton Bay in 2011 was 457 people. By 2016 the population was 19 showing a population decline of 95.8% in the area during that time. The predominant age group in Mount Dutton Bay is 50-59 years. Households in Mount Dutton Bay are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Mount Dutton Bay work in a professional occupation. In 2011, 83.1% of the homes in Mount Dutton Bay were owner-occupied compared with 89.5% in 2016.