Home Postcode finder WA Geegully Creek Geegully Creek postcode WA Geegully Creek 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 Geegully Creek business listing Be the first listing in Geegully Creek Common questionsWhat is the postcode for Geegully Creek?Geegully Creek, WA has the postcode 6728.What state is Geegully Creek in?Geegully Creek 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 Geegully Creek. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.