The size of Sebastian is approximately 30.1 square kilometres. It has 2 parks covering nearly 16.1% of total area. The population of Sebastian in 2016 was 217 people. By 2021 the population was 251 showing a population growth of 15.7% in the area during that time. The predominant age group in Sebastian is 60-69 years. Households in Sebastian are primarily couples with children and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Sebastian work in a trades occupation.In 2021, 92.10% of the homes in Sebastian were owner-occupied compared with 94.20% in 2016.
Sebastian has 142 properties. Over the last 5 years, Houses in Sebastian have seen a 72.64% increase in median value. As at 31 October 2025:
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