The size of Caldwell is approximately 330.1 square kilometres. The population of Caldwell in 2011 was 232 people. By 2016 the population was 29 showing a population decline of 87.5% in the area during that time. The predominant age group in Caldwell is 20-29 years. Households in Caldwell are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Caldwell work in a managers occupation. In 2011, 72.6% of the homes in Caldwell were owner-occupied compared with 136.4% in 2016.