Seymour is a town located in the Southern end of the Goulburn Valley in the Shire of Mitchell, Victoria, Australia and is located 104 kilometres …Seymour is a town located in the Southern end of the Goulburn Valley in the Shire of Mitchell, Victoria, Australia and is located 104 kilometres north of Melbourne. At the 2021 census, Seymour had a population of 6,569. The township services the surrounding agricultural industries as well as the nearby military base of Puckapunyal, which is an important training centre for the Australian Army. Other important sectors of employment in Seymour include retail, light engineering, agricultural services support, medical services, and education.