Home Postcode finder WA Mullingar Mullingar postcode WA Mullingar is a locality in Western Australia covered by postcode 6430. Postcode 6430 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Mullingar business listing Be the first listing in Mullingar Common questionsWhat is the postcode for Mullingar?Mullingar, WA has the postcode 6430.What state is Mullingar in?Mullingar is in Western Australia (WA).Does postcode 6430 cover more than one suburb?Yes. Postcode 6430 covers 14 localities, so the postcode alone does not identify Mullingar. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.