The size of Brenanah is approximately 91 square kilometres. It has 17 parks covering nearly 59.5% of total area. The population of Brenanah in 2011 was 317 people. By 2016 the population was 12 showing a population decline of 96.2% in the area during that time. The predominant age group in Brenanah is 10-19 years. Households in Brenanah are primarily childless couples and are likely to be repaying $800 - $999 per month on mortgage repayments. In general, people in Brenanah work in a labourer occupation. In 2011, 80.5% of the homes in Brenanah were owner-occupied compared with 109.1% in 2016.