The size of Three Rivers is approximately 8,879.6 square kilometres. It has 8 parks covering nearly 1.6% of total area. The population of Three Rivers in 2011 was 2,796 people. By 2016 the population was 10 showing a population decline of 99.6% in the area during that time. The predominant age group in Three Rivers is 70-79 years. Households in Three Rivers are primarily childless couples and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Three Rivers work in a clerical occupation. In 2011, 39% of the homes in Three Rivers were owner-occupied compared with 69.2% in 2016.