The size of Middleton is approximately 18,748.7 square kilometres. It has 27 parks covering nearly 2.3% of total area. The population of Middleton in 2011 was 379 people. By 2016 the population was 4 showing a population decline of 98.9% in the area during that time. The predominant age group in Middleton is 60-69 years. Households in Middleton are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Middleton work in a managers occupation. In 2006, 100% of the homes in Middleton were owner-occupied compared with 65.3% in 2011.