The size of Willunga Hill is approximately 11.9 square kilometres. It has 1 park covering nearly 1.2% of total area. The population of Willunga Hill in 2011 was 407 people. By 2016 the population was 157 showing a population decline of 61.4% in the area during that time. The predominant age group in Willunga Hill is 20-29 years. Households in Willunga Hill are primarily couples with children and are likely to be repaying $3000 - $3999 per month on mortgage repayments. In general, people in Willunga Hill work in a managers occupation. In 2011, 83.6% of the homes in Willunga Hill were owner-occupied compared with 79.6% in 2016.