The size of Grogan is approximately 275.3 square kilometres. The population of Grogan in 2011 was 360 people. By 2016 the population was 85 showing a population decline of 76.4% in the area during that time. The predominant age group in Grogan is 0-9 years. Households in Grogan are primarily couples with children and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Grogan work in a managers occupation. In 2011, 81.8% of the homes in Grogan were owner-occupied compared with 72% in 2016.