merriwa postcode nswst Home ›› Postcode Finder ›› NSWST ›› Merriwa Merriwa local listingsThe suburb of Merriwa is located in NSW and has a postcode of 2329. Free merriwa business listing! 1St Joseph's SchoolMarquet St 02 654820352Merriwa Central SchoolBow St 02 65482119 View more business listings in merriwa Search and find other Postcodes in New South Wales or widen the search to Postcodes in Australia.