Home Postcodes by state NSW 2291 Postcode 2291 2291 is the postcode for 3 localities in NSW: Merewether, Merewether Heights and The Junction. Localities with postcode 2291MerewetherNSWMerewether HeightsNSWThe JunctionNSW Postcode 2291 State or territory New South Wales (NSW) Localities 3 Council area Newcastle Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2290 · Postcode 2292