Home Postcode finder WA Secret Harbour Secret Harbour postcode WA Secret Harbour is a locality in Western Australia covered by postcode 6173. Postcode 6173 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Secret Harbour business listing More business listings in Secret Harbour Businesses in Secret HarbourCJ Moves6 Milos Mews, Secret Harbour WA 6173, Australia · 0466899045Comet Bay College2 Allatoona Ave · 08 95538100Comet Bay Primary School85 Miltona Drive · 08 95249033 Common questionsWhat is the postcode for Secret Harbour?Secret Harbour, WA has the postcode 6173.What state is Secret Harbour in?Secret Harbour is in Western Australia (WA).Does postcode 6173 cover more than one suburb?No. Postcode 6173 covers Secret Harbour only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.