Home Postcode finder WA Derby Derby postcode WA Derby is a locality in Western Australia covered by postcode 6728. Postcode 6728 State or territory Western Australia (WA) Region North West Suburbs Add a free Derby business listing More business listings in Derby Businesses in DerbyBuccaneer Sea Safari Western AustraliaPO Box · 1300 781 391Derby Chamber Of Commerce Clarendon Street · 0419 918 218Derby District High SchoolAnderson St · 08 91933000 Common questionsWhat is the postcode for Derby?Derby, WA has the postcode 6728.What state is Derby in?Derby is in Western Australia (WA).Does postcode 6728 cover more than one suburb?Yes. Postcode 6728 covers 8 localities, so the postcode alone does not identify Derby. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.