The size of Trevallyn is approximately 9.9 square kilometres. It has 13 parks covering nearly 15.2% of total area. The population of Trevallyn in 2011 was 4,638 people. By 2016 the population was 4,567 showing a population decline of 1.5% in the area during that time. The predominant age group in Trevallyn is 40-49 years.…