Home Postcode finder NSW Mallowa Mallowa postcode NSW Mallowa is a locality in New South Wales covered by postcode 2400. Postcode 2400 State or territory New South Wales (NSW) Region NSW North Coast Add a free Mallowa business listing Be the first listing in Mallowa Common questionsWhat is the postcode for Mallowa?Mallowa, NSW has the postcode 2400.What state is Mallowa in?Mallowa is in New South Wales (NSW).Does postcode 2400 cover more than one suburb?Yes. Postcode 2400 covers 8 localities, so the postcode alone does not identify Mallowa. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.