The size of Coominya is approximately 114.7 square kilometres. The population of Coominya in 2011 was 1,174 people. By 2016 the population was 1,185 showing a population growth of 0.9% in the area during that time. The predominant age group in Coominya is 60-69 years. Households in Coominya are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Coominya work in a labourer occupation. In 2011, 78.4% of the homes in Coominya were owner-occupied compared with 77.6% in 2016. Currently the median sales price of houses in the area is $340,000.