The size of Grand Secret is approximately 1.0 square kilometres. The population of Grand Secret in 2016 was 168 people. By 2021 the population was 151 showing a population decline of 10.1% in the area during that time. The predominant age group in Grand Secret is 60-69 years. Households in Grand Secret are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Grand Secret work in a professional occupation.In 2021, 64.50% of the homes in Grand Secret were owner-occupied compared with 55.40% in 2016.
Grand Secret has 129 properties. Over the last 5 years, Houses in Grand Secret have seen a 121.48% increase in median value, while Units have seen a 1502.06% increase. As at 31 October 2025:
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