gillieston-heights postcode nswst Home ›› Postcode Finder ›› NSWST ›› Gillieston-Heights Gillieston Heights local listingsThe suburb of Gillieston Heights is located in NSW and has a postcode of 2321. Free gillieston heights business listing! Get the first free listing in gillieston heights! Search and find other Postcodes in New South Wales or widen the search to Postcodes in Australia.