The size of Biddelia is approximately 163.6 square kilometres. It has 15 parks covering nearly 95.2% of total area. The population of Biddelia in 2011 was 272 people. By 2016 the population was 6 showing a population decline of 97.8% in the area during that time. The predominant age group in Biddelia is 10-19 years. Households in Biddelia are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Biddelia work in a managers occupation. In 2006, 74.4% of the homes in Biddelia were owner-occupied compared with 82.1% in 2011.