The size of Collie is approximately 719.2 square kilometres. It has 2 parks covering nearly 0.1% of total area. The population of Collie in 2016 was 194 people. By 2021 the population was 177 showing a population decline of 8.8% in the area during that time. The predominant age group in Collie is 0-9 years. Households in Collie are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Collie work in a managers occupation.In 2021, 73.70% of the homes in Collie were owner-occupied compared with 72.00% in 2016.
Collie has 225 properties. Over the last 5 years, Houses in Collie have seen a 142.30% increase in median value. As at 31 October 2025:
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