The size of Willoughby is approximately 27 square kilometres. It has 2 parks covering nearly 6.6% of total area. The population of Willoughby in 2006 was 178 people. By 2011 the population was 321 showing a population growth of 80.3% in the area during that time. The predominant age group in Willoughby is 60-69 years. Households in Willoughby are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Willoughby work in a labourer occupation. In 2006, 83.6% of the homes in Willoughby were owner-occupied compared with 82.3% in 2011.