The size of Collaroy is approximately 2.7 square kilometres. It has 12 parks covering nearly 20% of total area. The population of Collaroy in 2011 was 14,387 people. By 2016 the population was 7,864 showing a population decline of 45.3% in the area during that time. The predominant age group in Collaroy is 30-39 years. Households in Collaroy are primarily couples with children and are likely to be repaying over $4000 per month on mortgage repayments. In general, people in Collaroy work in a professional occupation. In 2011, 73.8% of the homes in Collaroy were owner-occupied compared with 66.2% in 2016. Currently the median sales price of houses in the area is $3,600,000.