The size of Hampden is approximately 31.5 square kilometres. The population of Hampden in 2011 was 449 people. By 2016 the population was 70 showing a population decline of 84.4% in the area during that time. The predominant age group in Hampden is 10-19 years. Households in Hampden are primarily couples with children and are likely to be repaying $300 - $449 per month on mortgage repayments. In general, people in Hampden work in a managers occupation. In 2011, 83.8% of the homes in Hampden were owner-occupied compared with 62% in 2016.