Home Postcode finder WA Lyalls Mill Lyalls Mill postcode WA Lyalls Mill is a locality in Western Australia covered by postcode 6225. Postcode 6225 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Lyalls Mill business listing Be the first listing in Lyalls Mill Common questionsWhat is the postcode for Lyalls Mill?Lyalls Mill, WA has the postcode 6225.What state is Lyalls Mill in?Lyalls Mill is in Western Australia (WA).Does postcode 6225 cover more than one suburb?Yes. Postcode 6225 covers 18 localities, so the postcode alone does not identify Lyalls Mill. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.