The size of Alleena is approximately 269.5 square kilometres. It has 5 parks covering nearly 2.7% of total area. The population of Alleena in 2011 was 236 people. By 2016 the population was 45 showing a population decline of 80.9% in the area during that time. The predominant age group in Alleena is 10-19 years. Households in Alleena are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Alleena work in a managers occupation. In 2011, 83% of the homes in Alleena were owner-occupied compared with 42.8% in 2016.