The size of Kunjin is approximately 327.1 square kilometres. The population of Kunjin in 2011 was 238 people. By 2016 the population was 33 showing a population decline of 86.1% in the area during that time. The predominant age group in Kunjin is 50-59 years. Households in Kunjin are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Kunjin work in a managers occupation. In 2006, 8% of the homes in Kunjin were owner-occupied compared with 75.3% in 2011.