The size of Willunga is approximately 21.3 square kilometres. It has 5 parks covering nearly 0.7% of total area. The population of Willunga in 2011 was 2,415 people. By 2016 the population was 2,286 showing a population decline of 5.3% in the area during that time. The predominant age group in Willunga is 40-49 years. Households in Willunga are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Willunga work in a professional occupation. In 2011, 84.1% of the homes in Willunga were owner-occupied compared with 83.1% in 2016. Currently the median sales price of houses in the area is $670,000.