garthowen postcode nsw Home ›› Postcode Finder ›› NSW ›› Garthowen Garthowen local listingsThe suburb of Garthowen is located in NSW and has a postcode of 2345. Free garthowen business listing! Get the first free listing in garthowen! Search and find other Postcodes in New South Wales or widen the search to Postcodes in Australia.