The size of Buchanan is approximately 24,254.3 square kilometres. It has 6 parks. The population of Buchanan in 2011 was 106 people. By 2016 the population was 43 showing a population decline of 59.4% in the area during that time. The predominant age group in Buchanan is 20-29 years. Households in Buchanan are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Buchanan work in a labourer occupation.