Home Postcodes by state NSW 2299 Postcode 2299 2299 is the postcode for 3 localities in NSW: Jesmond, Lambton and North Lambton. Localities with postcode 2299JesmondNSWLambtonNSWNorth LambtonNSW Postcode 2299 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 2298 · Postcode 2300