The size of Wompinie is approximately 286.3 square kilometres. The population of Wompinie in 2011 was 493 people. By 2016 the population was 81 showing a population decline of 83.6% in the area during that time. The predominant age group in Wompinie is 20-29 years. Households in Wompinie are primarily couples with children and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Wompinie work in a managers occupation. In 2011, 56.4% of the homes in Wompinie were owner-occupied compared with 58.3% in 2016.