The size of Kalkallo is approximately 7 square kilometres. The population of Kalkallo in 2011 was 32,756 people. By 2016 the population was 99 showing a population decline of 99.7% in the area during that time. The predominant age group in Kalkallo is 60-69 years. Households in Kalkallo are primarily couples with children and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Kalkallo work in a sales workers occupation. In 2011, 78.8% of the homes in Kalkallo were owner-occupied compared with 75.7% in 2016. Currently the median sales price of houses in the area is $595,000.