Merton is a locality on the Maroondah Highway in north-east Victoria, Australia, west of Bonnie Doon. At the 2021 census, Merton had a po…Merton is a locality on the Maroondah Highway in north-east Victoria, Australia, west of Bonnie Doon. At the 2021 census, Merton had a population of 216. Merton Post Office opened on 1 July 1858. The railway to Mansfield arrived in the locality from Tallarook in 1890, and closed on 18 November 1978. The last passenger service was on 28 May 1977.