The size of Galston is approximately 23.7 square kilometres. It has 7 parks covering nearly 31.9% of total area. The population of Galston in 2011 was 2,999 people. By 2016 the population was 3,138 showing a population growth of 4.6% in the area during that time. The predominant age group in Galston is 50-59 years. Households in Galston are primarily couples with children and are likely to be repaying $3000 - $3999 per month on mortgage repayments. In general, people in Galston work in a professional occupation. In 2011, 79.8% of the homes in Galston were owner-occupied compared with 79.9% in 2016. Currently the median sales price of houses in the area is $1,805,000.