The size of Ellerslie is approximately 23.1 square kilometres. The population of Ellerslie in 2011 was 379 people. By 2016 the population was 88 showing a population decline of 76.8% in the area during that time. The predominant age group in Ellerslie is 0-9 years. Households in Ellerslie are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Ellerslie work in a managers occupation. In 2011, 65.2% of the homes in Ellerslie were owner-occupied compared with 47.1% in 2016.