The size of Osmaston is approximately 24.9 square kilometres. It has 3 parks covering nearly 15.9% of total area. The population of Osmaston in 2016 was 88 people. By 2021 the population was 96 showing a population growth of 9.1% in the area during that time. The predominant age group in Osmaston is 50-59 years. Households in Osmaston are primarily childless couples and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Osmaston work in a managers occupation.In 2021, 55.90% of the homes in Osmaston were owner-occupied compared with 80.50% in 2016..
Osmaston has 42 properties. Over the last 5 years, Houses in Osmaston have seen a 102.94% increase in median value, while Units have seen a 47.64% increase. As at 30 June 2025:
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