The size of Custon is approximately 45.8 square kilometres. It has 2 parks covering nearly 1.4% of total area. The population of Custon in 2011 was 212 people. By 2016 the population was 6 showing a population decline of 97.2% in the area during that time. The predominant age group in Custon is 0-9 years. Households in Custon are primarily couples with children and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Custon work in a managers occupation. In 2006, 35.9% of the homes in Custon were owner-occupied compared with 77.5% in 2011.