Home Postcodes by state NSW 2878 Postcode 2878 2878 is the postcode for 2 localities in NSW: Ivanhoe and Mossgiel. Localities with postcode 2878IvanhoeNSWMossgielNSW Postcode 2878 State or territory New South Wales (NSW) Localities 2 Council area Central Darling; Mainly Central Darling, partly Carrathool Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2877 · Postcode 2879