The size of Callaghan is approximately 1.4 square kilometres. It has 4 parks covering nearly 14.3% of total area. The population of Callaghan in 2011 was 652 people. By 2016 the population was 1,320 showing a population growth of 102.5% in the area during that time. The predominant age group in Callaghan is 20-29 years. Households in Callaghan are primarily couples with children and are likely to be repaying $950 - $1199 per month on mortgage repayments. In general, people in Callaghan work in a community and personal service occupation.