Home Postcode finder WA Lake Deborah Lake Deborah postcode WA Lake Deborah is a locality in Western Australia covered by postcode 6484. Postcode 6484 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Lake Deborah business listing Be the first listing in Lake Deborah Common questionsWhat is the postcode for Lake Deborah?Lake Deborah, WA has the postcode 6484.What state is Lake Deborah in?Lake Deborah is in Western Australia (WA).Does postcode 6484 cover more than one suburb?Yes. Postcode 6484 covers 3 localities, so the postcode alone does not identify Lake Deborah. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.