Home Postcode finder NSWDL Flat Tops Flat Tops postcode NSWDL Flat Tops is a locality in New South Wales covered by postcode 2420. Postcode 2420 State or territory New South Wales (NSWDL) Region Hunter Add a free Flat Tops business listing Be the first listing in Flat Tops Common questionsWhat is the postcode for Flat Tops?Flat Tops, NSWDL has the postcode 2420.What state is Flat Tops in?Flat Tops is in New South Wales (NSWDL).Does postcode 2420 cover more than one suburb?Yes. Postcode 2420 covers 23 localities, so the postcode alone does not identify Flat Tops. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.