Home Postcode finder WA Mount Caroline Mount Caroline postcode WA Mount Caroline is a locality in Western Australia covered by postcode 6410. Postcode 6410 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Mount Caroline business listing Be the first listing in Mount Caroline Common questionsWhat is the postcode for Mount Caroline?Mount Caroline, WA has the postcode 6410.What state is Mount Caroline in?Mount Caroline is in Western Australia (WA).Does postcode 6410 cover more than one suburb?Yes. Postcode 6410 covers 4 localities, so the postcode alone does not identify Mount Caroline. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.