The size of Middlesex is approximately 82.8 square kilometres. It has 15 parks covering nearly 33% of total area. The population of Middlesex in 2011 was 379 people. By 2016 the population was 213 showing a population decline of 43.8% in the area during that time. The predominant age group in Middlesex is 50-59 years. Households in Middlesex are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Middlesex work in a managers occupation. In 2011, 67.5% of the homes in Middlesex were owner-occupied compared with 77% in 2016.