Home Postcodes by state NT 0840 Postcode 0840 0840 is the postcode for 3 localities in NT: Dundee Beach, Dundee Downs and Dundee Forest. Localities with postcode 0840Dundee BeachNTDundee DownsNTDundee ForestNT Postcode 0840 State or territory Northern Territory (NT) Localities 3 Council area Unincorporated NT Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 0839 · Postcode 0841