holts-flat postcode nsw Home ›› Postcode Finder ›› NSW ›› Holts-Flat Holts Flat local listingsThe suburb of Holts Flat is located in NSW and has a postcode of 2631. Free holts flat business listing! Get the first free listing in holts flat! Search and find other Postcodes in New South Wales or widen the search to Postcodes in Australia.