The size of Port Willunga is approximately 2.2 square kilometres. It has 6 parks covering nearly 14.6% of total area. The population of Port Willunga in 2011 was 1,673 people. By 2016 the population was 1,624 showing a population decline of 2.9% in the area during that time. The predominant age group in Port Willunga is 40-49 years. Households in Port Willunga are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Port Willunga work in a professional occupation. In 2011, 72.3% of the homes in Port Willunga were owner-occupied compared with 73% in 2016. Currently the median sales price of houses in the area is $535,000.