The size of Boallia is approximately 37.5 square kilometres. It has 1 park covering nearly 33.1% of total area. The population of Boallia in 2011 was 278 people. By 2016 the population was 29 showing a population decline of 89.6% in the area during that time. The predominant age group in Boallia is 50-59 years. Households in Boallia are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Boallia work in a professional occupation. In 2011, 69.3% of the homes in Boallia were owner-occupied compared with 42.8% in 2016.