The size of Rocklyn is approximately 17.4 square kilometres. It has 1 park covering nearly 44.3% of total area. The population of Rocklyn in 2011 was 284 people. By 2016 the population was 54 showing a population decline of 81.0% in the area during that time. The predominant age group in Rocklyn is 60-69 years. Households in Rocklyn are primarily childless couples and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Rocklyn work in a labourer occupation. In 2011, 85.3% of the homes in Rocklyn were owner-occupied compared with 80.9% in 2016..
Rocklyn has 63 properties.
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