Home Postcode finder NSW Kains Flat Kains Flat postcode NSW Kains Flat is a locality in New South Wales covered by postcode 2850. Postcode 2850 State or territory New South Wales (NSW) Region NSW Country West Add a free Kains Flat business listing Be the first listing in Kains Flat Common questionsWhat is the postcode for Kains Flat?Kains Flat, NSW has the postcode 2850.What state is Kains Flat in?Kains Flat is in New South Wales (NSW).Does postcode 2850 cover more than one suburb?Yes. Postcode 2850 covers 77 localities, so the postcode alone does not identify Kains Flat. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.