Home Postcodes by state NSW 2290 Postcode 2290 2290 is the postcode for 10 localities in NSW: Bennetts Green, Charlestown, Dudley, Gateshead, Hillsborough, Kahibah and 4 more. Localities with postcode 2290Bennetts GreenNSWCharlestownNSWDudleyNSWGatesheadNSWHillsboroughNSWKahibahNSWMount HuttonNSWRedheadNSWTingira HeightsNSWWhitebridgeNSW Postcode 2290 State or territory New South Wales (NSW) Localities 10 Council area Lake Macquarie Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2289 · Postcode 2291