The size of Brobenah is approximately 98.2 square kilometres. The population of Brobenah in 2011 was 645 people. By 2016 the population was 3 showing a population decline of 99.5% in the area during that time. The predominant age group in Brobenah is 10-19 years. Households in Brobenah are primarily couples with children and are likely to be repaying $600 - $799 per month on mortgage repayments. In general, people in Brobenah work in a managers occupation. In 2006, 22.8% of the homes in Brobenah were owner-occupied compared with 79.9% in 2011.