The size of Duval is approximately 20.1 square kilometres. It has 2 parks covering nearly 13.4% of total area. The population of Duval in 2006 was 21,660 people. By 2011 the population was 331 showing a population decline of 98.5% in the area during that time. The predominant age group in Duval is 40-49 years. Households in Duval are primarily couples with children and are likely to be repaying over $4000 per month on mortgage repayments. In general, people in Duval work in a managers occupation. In 2006, 60% of the homes in Duval were owner-occupied compared with 77.2% in 2011.