Home Postcode finder WA Lennard Brook Lennard Brook postcode WA Lennard Brook is a locality in Western Australia covered by postcode 6503. Postcode 6503 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Lennard Brook business listing Be the first listing in Lennard Brook Common questionsWhat is the postcode for Lennard Brook?Lennard Brook, WA has the postcode 6503.What state is Lennard Brook in?Lennard Brook is in Western Australia (WA).Does postcode 6503 cover more than one suburb?Yes. Postcode 6503 covers 20 localities, so the postcode alone does not identify Lennard Brook. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.