The size of Gymea is approximately 2.2 square kilometres. It has 2 parks. The population of Gymea in 2011 was 7,174 people. By 2016 the population was 7,577 showing a population growth of 5.6% in the area during that time. The predominant age group in Gymea is 40-49 years. Households in Gymea are primarily couples with children and are likely to be repaying $3000 - $3999 per month on mortgage repayments. In general, people in Gymea work in a professional occupation. In 2011, 69.5% of the homes in Gymea were owner-occupied compared with 66.7% in 2016. Currently the median sales price of houses in the area is $1,620,000.