Home Postcodes by state NSW 2659 Postcode 2659 2659 is the postcode for 2 localities in NSW: Alma Park and Walla Walla. Localities with postcode 2659Alma ParkNSWWalla WallaNSW Postcode 2659 State or territory New South Wales (NSW) Localities 2 Council area Mainly Greater Hume, partly Lockhart; Greater Hume Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2658 · Postcode 2660