The size of Ganmain is approximately 440.8 square kilometres. It has 7 parks covering nearly 2.9% of total area. The population of Ganmain in 2011 was 614 people. By 2016 the population was 794 showing a population growth of 29.3% in the area during that time. The predominant age group in Ganmain is 60-69 years. Households in Ganmain are primarily childless couples and are likely to be repaying $600 - $799 per month on mortgage repayments. In general, people in Ganmain work in a managers occupation. In 2011, 81.3% of the homes in Ganmain were owner-occupied compared with 81.8% in 2016. Currently the median sales price of houses in the area is $182,000.