The size of Casuarina is approximately 3 square kilometres. The population of Casuarina in 2006 was 890 people. By 2011 the population was 1,659 showing a population growth of 86% in the area during that time. The predominant age group in Casuarina is 0-14 years.Households in Casuarina are primarily couples with children. In general, people in Casuarina work in a Professional occupation. In 2006, 64.6% of the homes in Casuarina were owner-occupied compared with 52.5% in 2011.