Melbourne is the capital and most populous city of the Australian state of Victoria, and the second-most populous city in both Australia and Oc…Melbourne is the capital and most populous city of the Australian state of Victoria, and the second-most populous city in both Australia and Oceania. Its name generally refers to a 9,993 km² metropolitan area also known as Greater Melbourne, comprising an urban agglomeration of 31 local municipalities, although the name is also used specifically for the local municipality of City of Melbourne based around its central business area.