The size of Willoughby is approximately 1.6 square kilometres. It has 5 parks covering nearly 5% of total area. The population of Willoughby in 2011 was 5,920 people. By 2016 the population was 6,504 showing a population growth of 9.9% in the area during that time. The predominant age group in Willoughby is 40-49 years. Households in Willoughby are primarily couples with children and are likely to be repaying over $4000 per month on mortgage repayments. In general, people in Willoughby work in a professional occupation. In 2011, 70.4% of the homes in Willoughby were owner-occupied compared with 70.1% in 2016. Currently the median sales price of houses in the area is $3,360,000.