Home Postcodes by state NSW 2506 Postcode 2506 2506 is the postcode for Berkeley, NSW. Localities with postcode 2506BerkeleyNSW Postcode 2506 State or territory New South Wales (NSW) Localities 1 Council area Wollongong Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2505 · Postcode 2508