The size of Mirannie is approximately 101 square kilometres. The population of Mirannie in 2011 was 397 people. By 2016 the population was 59 showing a population decline of 85.1% in the area during that time. The predominant age group in Mirannie is 50-59 years. Households in Mirannie are primarily childless couples and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Mirannie work in a managers occupation. In 2011, 82.9% of the homes in Mirannie were owner-occupied compared with 73.1% in 2016.