Home Postcodes by state NSW 2356 Postcode 2356 2356 is the postcode for Gwabegar, NSW. Localities with postcode 2356GwabegarNSW Postcode 2356 State or territory New South Wales (NSW) Localities 1 Council area Narrabri Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2355 · Postcode 2357