The size of Buchanan is approximately 30.6 square kilometres. It has 3 parks covering nearly 4.4% of total area. The population of Buchanan in 2011 was 655 people. By 2016 the population was 188 showing a population decline of 71.3% in the area during that time. The predominant age group in Buchanan is 10-19 years. Households in Buchanan are primarily childless couples and are likely to be repaying $2400 - $2999 per month on mortgage repayments. In general, people in Buchanan work in a clerical occupation. In 2011, 85.8% of the homes in Buchanan were owner-occupied compared with 80.7% in 2016.