The size of Winnambool is approximately 106.5 square kilometres. The population of Winnambool in 2011 was 479 people. By 2016 the population was 10 showing a population decline of 97.9% in the area during that time. The predominant age group in Winnambool is 0-9 years. Households in Winnambool are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Winnambool work in a managers occupation. In 2006, 12.9% of the homes in Winnambool were owner-occupied compared with 75.1% in 2011.