Home Postcodes by state NSW 2643 Postcode 2643 2643 is the postcode for Howlong, NSW. Localities with postcode 2643HowlongNSW Postcode 2643 State or territory New South Wales (NSW) Localities 1 Council area Federation Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2642 · Postcode 2644