Home Postcode finder NSW Louth Louth postcode NSW Louth is a locality in New South Wales covered by postcode 2840. Postcode 2840 State or territory New South Wales (NSW) Region NSW Country West Add a free Louth business listing More business listings in Louth Businesses in LouthLouth Public SchoolLot 1 Hughes St · 02 68747426 Common questionsWhat is the postcode for Louth?Louth, NSW has the postcode 2840.What state is Louth in?Louth is in New South Wales (NSW).Does postcode 2840 cover more than one suburb?Yes. Postcode 2840 covers 11 localities, so the postcode alone does not identify Louth. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.