The size of Forth is approximately 34.8 square kilometres. It has 13 parks covering nearly 2.8% of total area. The population of Forth in 2011 was 1,024 people. By 2016 the population was 727 showing a population decline of 29.0% in the area during that time. The predominant age group in Forth is 60-69 years. Households in Forth are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Forth work in a professional occupation. In 2011, 83.3% of the homes in Forth were owner-occupied compared with 84.8% in 2016. Currently the median sales price of houses in the area is $585,000.