The size of Dallarnil is approximately 148.2 square kilometres. It has 1 park. The population of Dallarnil in 2011 was 329 people. By 2016 the population was 227 showing a population decline of 31.0% in the area during that time. The predominant age group in Dallarnil is 60-69 years. Households in Dallarnil are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Dallarnil work in a managers occupation. In 2011, 84.2% of the homes in Dallarnil were owner-occupied compared with 82.7% in 2016. Currently the median sales price of houses in the area is $192,500.