smithtown postcode nswst Home ›› Postcode Finder ›› NSWST ›› Smithtown Smithtown local listingsThe suburb of Smithtown is located in NSW and has a postcode of 2440. Free smithtown business listing! 1Smithtown Public School30-38 Cannane St 02 65674529 View more business listings in smithtown Search and find other Postcodes in New South Wales or widen the search to Postcodes in Australia.