The size of St Mary is approximately 185.6 square kilometres. It has 1 park covering nearly 76.9% of total area. The population of St Mary in 2016 was 73 people. By 2021 the population was 34 showing a population decline of 53.4% in the area during that time. The predominant age group in St Mary is 60-69 years. Households in St Mary are primarily childless couples and are likely to be repaying $600 - $799 per month on mortgage repayments. In general, people in St Mary work in a managers occupation.In 2021, 118.20% of the homes in St Mary were owner-occupied compared with 116.70% in 2016.
St Mary has 87 properties. As at 30 November 2025:
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