The size of Casula is approximately 6.9 square kilometres. It has 19 parks covering nearly 10.1% of total area. The population of Casula in 2011 was 14,696 people. By 2016 the population was 15,653 showing a population growth of 6.5% in the area during that time. The predominant age group in Casula is 10-19 years. Households in Casula are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Casula work in a professional occupation. In 2011, 68.8% of the homes in Casula were owner-occupied compared with 67.6% in 2016. Currently the median sales price of houses in the area is $950,000.