Home Postcode finder WA Lake Wells Lake Wells postcode WA Lake Wells is a locality in Western Australia covered by postcode 6440. Postcode 6440 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Lake Wells business listing Be the first listing in Lake Wells Common questionsWhat is the postcode for Lake Wells?Lake Wells, WA has the postcode 6440.What state is Lake Wells in?Lake Wells is in Western Australia (WA).Does postcode 6440 cover more than one suburb?Yes. Postcode 6440 covers 6 localities, so the postcode alone does not identify Lake Wells. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.