The size of Kulwin is approximately 3,678.8 square kilometres. It has 2 parks covering nearly 0.7% of total area. The population of Kulwin in 2011 was 429 people. By 2016 the population was 3 showing a population decline of 99.3% in the area during that time. The predominant age group in Kulwin is 20-29 years. Households in Kulwin are primarily couples with children and are likely to be repaying over $4000 per month on mortgage repayments. In general, people in Kulwin work in a managers occupation. In 2006, 16.7% of the homes in Kulwin were owner-occupied compared with 87.2% in 2011.