The size of Black Rock is approximately 103.3 square kilometres. The population of Black Rock in 2016 was 36 people. By 2021 the population was 36 showing a stable population in the area during that time. The predominant age group in Black Rock is 60-69 years. Households in Black Rock are primarily childless couples and are likely to be repaying $2400 - $2999 per month on mortgage repayments. In general, people in Black Rock work in a managers occupation.In 2021, 114.30% of the homes in Black Rock were owner-occupied compared with 86.70% in 2016.
Black Rock has 51 properties. Over the last 5 years, Houses in Black Rock have seen a -34.28% decrease in median value, while Units have seen a 32.75% increase. As at 30 November 2025:
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