Home Postcode finder WA Cooladar Hill Cooladar Hill postcode WA Cooladar Hill is a locality in Western Australia covered by postcode 6638. Postcode 6638 State or territory Western Australia (WA) Region North West Suburbs Add a free Cooladar Hill business listing Be the first listing in Cooladar Hill Common questionsWhat is the postcode for Cooladar Hill?Cooladar Hill, WA has the postcode 6638.What state is Cooladar Hill in?Cooladar Hill is in Western Australia (WA).Does postcode 6638 cover more than one suburb?Yes. Postcode 6638 covers 4 localities, so the postcode alone does not identify Cooladar Hill. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.