The size of Monsildale is approximately 328.8 square kilometres. It has 9 parks covering nearly 37.3% of total area. The population of Monsildale in 2011 was 431 people. By 2016 the population was 12 showing a population decline of 97.2% in the area during that time. The predominant age group in Monsildale is 10-19 years. Households in Monsildale are primarily childless couples and are likely to be repaying $600 - $799 per month on mortgage repayments. In general, people in Monsildale work in a managers occupation. In 2006, 31.6% of the homes in Monsildale were owner-occupied compared with 62.4% in 2011.