dum-dum postcode nswrv Home ›› Postcode Finder ›› NSWRV ›› Dum-Dum Dum Dum local listingsThe suburb of Dum Dum is located in NSW and has a postcode of 2484. Free dum dum business listing! Get the first free listing in dum dum! Search and find other Postcodes in New South Wales or widen the search to Postcodes in Australia.