The size of Mullaley is approximately 313.8 square kilometres. The population of Mullaley in 2011 was 540 people. By 2016 the population was 141 showing a population decline of 73.9% in the area during that time. The predominant age group in Mullaley is 40-49 years. Households in Mullaley are primarily childless couples and are likely to be repaying $450 - $599 per month on mortgage repayments. In general, people in Mullaley work in a managers occupation. In 2011, 69.8% of the homes in Mullaley were owner-occupied compared with 69.8% in 2016.