The size of Poonindie is approximately 25.9 square kilometres. The population of Poonindie in 2011 was 503 people. By 2016 the population was 182 showing a population decline of 63.8% in the area during that time. The predominant age group in Poonindie is 10-19 years. Households in Poonindie are primarily couples with children and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Poonindie work in a trades occupation. In 2011, 79.7% of the homes in Poonindie were owner-occupied compared with 77.6% in 2016.