howlong postcode nswdl Home ›› Postcode Finder ›› NSWDL ›› Howlong Howlong local listingsThe suburb of Howlong is located in NSW and has a postcode of 2643. Free howlong business listing! 1Howlong Public School121-135 Hawkins St 02 60265206 View more business listings in howlong Search and find other Postcodes in New South Wales or widen the search to Postcodes in Australia.