The size of Wilby is approximately 110.4 square kilometres. The population of Wilby in 2011 was 270 people. By 2016 the population was 160 showing a population decline of 40.7% in the area during that time. The predominant age group in Wilby is 50-59 years. Households in Wilby are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Wilby work in a clerical occupation. In 2011, 84.5% of the homes in Wilby were owner-occupied compared with 90% in 2016.