The size of Dumaresq Island is approximately 8.5 square kilometres. The population of Dumaresq Island in 2016 was 62 people. By 2021 the population was 70 showing a population growth of 12.9% in the area during that time. The predominant age group in Dumaresq Island is 50-59 years. Households in Dumaresq Island are primarily childless couples and are likely to be repaying $3000 - $3999 per month on mortgage repayments. In general, people in Dumaresq Island work in a managers occupation.In 2021, 60.00% of the homes in Dumaresq Island were owner-occupied compared with 74.10% in 2016.
Dumaresq Island has 33 properties. As at 30 November 2025:
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