Home Postcode finder NSW Howlong Howlong postcode NSW Howlong is a locality in New South Wales covered by postcode 2643. Postcode 2643 State or territory New South Wales (NSW) Region Canberra Add a free Howlong business listing More business listings in Howlong Businesses in HowlongHowlong Public School121-135 Hawkins St · 02 60265206 Common questionsWhat is the postcode for Howlong?Howlong, NSW has the postcode 2643.What state is Howlong in?Howlong is in New South Wales (NSW).Does postcode 2643 cover more than one suburb?No. Postcode 2643 covers Howlong only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.