The size of Briarbrook is approximately 100 square kilometres. The population of Briarbrook in 2011 was 1,174 people. By 2016 the population was 7 showing a population decline of 99.4% in the area during that time. The predominant age group in Briarbrook is 10-19 years. Households in Briarbrook are primarily couples with children and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Briarbrook work in a managers occupation. In 2006, 74.1% of the homes in Briarbrook were owner-occupied compared with 72% in 2011.