The size of Marion Bay is approximately 301.3 square kilometres. It has 2 parks covering nearly 13.9% of total area. The population of Marion Bay in 2016 was 172 people. By 2021 the population was 210 showing a population growth of 22.1% in the area during that time. The predominant age group in Marion Bay is 50-59 years. Households in Marion Bay are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Marion Bay work in a labourer occupation.In 2021, 78.40% of the homes in Marion Bay were owner-occupied compared with 70.80% in 2016.
Marion Bay has 575 properties. Over the last 5 years, Houses in Marion Bay have seen a 99.86% increase in median value. As at 31 October 2025:
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