The size of Millbank is approximately 120.3 square kilometres. It has 4 parks covering nearly 42.7% of total area. The population of Millbank in 2011 was 264 people. By 2016 the population was 124 showing a population decline of 53.0% in the area during that time. The predominant age group in Millbank is 50-59 years. Households in Millbank are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Millbank work in a managers occupation. In 2011, 75.5% of the homes in Millbank were owner-occupied compared with 78.8% in 2016.