The size of Blue Rocks is approximately 7.9 square kilometres. It has 5 parks covering nearly 4.8% of total area. The population of Blue Rocks in 2011 was 447 people. By 2016 the population was 13 showing a population decline of 97.1% in the area during that time. The predominant age group in Blue Rocks is 50-59 years. Households in Blue Rocks are primarily couples with children and are likely to be repaying $600 - $799 per month on mortgage repayments. In general, people in Blue Rocks work in a trades occupation. In 2006, 20.3% of the homes in Blue Rocks were owner-occupied compared with 71.5% in 2011.