Ferntree Gully is a suburb in Melbourne, Victoria, Australia, in the Dandenong Ranges, 32 km east of Melbourne's central business district. It is in the local government area of the City of Knox. At the 2011 Census, Ferntree Gully had a population of 25,585: 49.5% of this male and 50.5% female. The median/average age of a person was 38 years, one year above the Australian average. 75% of people living in Ferntree Gully were born in Australia. 48.5% of people are married.