Home Postcodes by state NSW 2842 Postcode 2842 2842 is the postcode for 3 localities in NSW: Mendooran, Mollyan and Yarragrin. Localities with postcode 2842MendooranNSWMollyanNSWYarragrinNSW Postcode 2842 State or territory New South Wales (NSW) Localities 3 Council area Mainly Warrumbungle, partly Gilgandra; Warrumbungle Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2840 · Postcode 2843