Home Postcode finder WA Minigin Minigin postcode WA Minigin is a locality in Western Australia covered by postcode 6312. Postcode 6312 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Minigin business listing Be the first listing in Minigin Common questionsWhat is the postcode for Minigin?Minigin, WA has the postcode 6312.What state is Minigin in?Minigin is in Western Australia (WA).Does postcode 6312 cover more than one suburb?Yes. Postcode 6312 covers 9 localities, so the postcode alone does not identify Minigin. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.