killingworth postcode nswst Home ›› Postcode Finder ›› NSWST ›› Killingworth Killingworth local listingsThe suburb of Killingworth is located in NSW and has a postcode of 2278. Free killingworth business listing! Get the first free listing in killingworth! Search and find other Postcodes in New South Wales or widen the search to Postcodes in Australia.