The size of Opalton is approximately 16,931.2 square kilometres. It has 14 parks covering nearly 6.9% of total area. The population of Opalton in 2011 was 379 people. By 2016 the population was 50 showing a population decline of 86.8% in the area during that time. The predominant age group in Opalton is 70-79 years. Households in Opalton are primarily couples with children and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Opalton work in a managers occupation. In 2011, 65.3% of the homes in Opalton were owner-occupied compared with 61.3% in 2016.